Addressing the OP: IMO if you need absolute reliability in a single vehicle - ie your vehicle runs or you don't get paid - then you probably should avoid bikes completely, or else stick with something bulletproof. I would weigh the reliability and service of the nearby dealers more highly as anything about the bike itself. Many dealers - and in fairness, many owners - treat motorcycles as toys, so quick turnarounds on service may be lower priority.
If you have a fallback plan - another vehicle for inclement weather, carpooling with a friend, or other transit alternatives - then a bike may be suitable, and electrics are worth consideration if their capabilities and limitations align well with your commuting patterns.a
Here's my anecdotal experience.
I've owned my 2012 Zero for about 3 years. In that time, the bike has been out of service for around 4 months, including about a month after I snapped the kickstand off in a lowside. When the bike has been in service, I have commuted on every day save perhaps 20 to 30 days by pedal bike or car, typically for severe weather, cargo, or other times when a bike was logistically difficult.
I do not live near a dealer now and have never lived near a dealer. Three times the bike has required transport for service: twice for encoder issues, and once to replace the battery monolith (water ingress). Two times the bike was freighted back to Zero and once I hauled it to a dealer approximately 120 miles away. In each case the defect was repaired under warranty, and while I would have preferred swifter resolutions, ultimately I have been pleased by Zero's willingness to stand behind their bikes.
Outside of those servicing trips, the bike has needed very little maintenance at 14000 miles. The rear tire has been replaced once, both the original front and the replacement rear need to be replaced soon, and the brakes have been serviced.
My commuting distance requirements today are much shorter than when I bought the bike, but even when I was commuting 25-50+ miles per day I never ran "out" of range, and only on two instances was I concerned about fully depleting the pack on a commute. Both instances were abnormal response of the energy meter following sub-30F cold soaks on long riding days, and may have been caused by the water ingress in my pack. Since replacement 1.5 years ago, I have yet to see similar behavior during even colder days in Nashville. With the caveat that the current pack only has about 1.5 years on it, I haven't noticed a decrease in total range.
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So my recommendation? Talk to your dealer nearby. Ask about servicing for electric bikes, and whether they have invested in tools and training from Zero. Ask about past servicing history, and make your concerns about servicing turnaround times clear. Consider your options in case the bike was unavailable for several weeks (true for any bike, not just Zero or electrics).
Personally I have been pleased with my experience using the Zero as a commuter, and if you're willing to tolerate some downtime and you have a solid nearby dealer then I would have no problems recommending the Zeros. Zero has made significant improvements in reliability since the 2012s and sounds like they're putting an increased emphasis on product quality internally, so I hope going forward that they can follow through on the low-maintenance promise of electrics.
By all means.
Smooth acceleration: the DCT box handles this very well.
Low maintenance: the NC has longer service intervals than a lot of ICE bikes, but EV's win here.
Maximum torque available through the rev range: The DCT does a good job of keeping the engine where it produces the most torque. The torque multiplication of using gears makes up for the shortfall in maximum torque compared to an electric motor.
Good for the environment: the NC has very low emissions for an ICE bike. Zero wins here of course.
Those are some of the positives for electric I can think of right now. Please note I'm not mentioning any of the negatives. Don't get me wrong, I'd love an SR but I can't afford one. I also only want to run one bike and it has to be reliable all year round in all weather conditions. Zero aren't there yet IMHO.
The NC7XX DCT is a pretty decent comparison to electrics for commuting. The internal "tank" storage is better thought-out, Honda's DCT works reasonably well (at the cost of some mechanical complexity), the servicing requirements are low and the ease of riding is high. It's also very reasonably priced, and of course can be used for longer trips with ease.
Where electrics win is ease of fueling (10s to plug in at home), theoretically lower maintenance, lower weight, responsiveness, and sound (IMO). They're also still quite novel, which can either be a positive (show up at a bike night and everyone is going to want to know WTF you're riding) or a negative (sometimes you may not want that attention).