Have I missed anything important?
Tires.
Brakes.
Brake fluid.
vibration induced non-critical fastener loosening.
every bearing.
fork alignment.
wheel alignment and runout.
While its nice that there is no motor assembly to maintain... if you owned something like my last honda, then the only maintenance reductions are oil changes and chain vs belt.
I had their flagship CBR1000RR and put 78,000 HARD miles on it. While talking EVs its nice to think about how clean and easy to maintain they are.. lets pull it back to reality a bit.
You have to maintain everything a normal motorcycle has to, except the engine. Just listing things Ive done on a regular basis with bikes not involving the engine/fuel system/etc.
Fork spring swap (unless you weigh perfectly on spec or a noob that doesnt know how important this is)
Rear shock spring swap.
Fork alignment.
Wheel alignment.
steering head bearings check/replacement
Wheel bearings check/replacement
swingarm bearings check/replacement
check rear drive alignment (that would be belt or change angle, not tension.)
belt or chain tension.
Tire checks.
light checks.
brake pad checks.
brake fluid checks.
brake line checks. (abrasion primarily, with SS lines like zero, the lines may be ok, but they can rub and destroy things like fork coatings, paint, etc )
brake pad replacement
brake fluid replacement.
lever pivot checks
kickstand check (especially on a cast kickstand like the zero has)
non-critical fastener checks. (headstay, gauges, turn signals, taillight, farkles, etc)
It may sound pedantic. Most of the Zeros are brand new bikes. Most of you will not do a lot of miles. When you have a brand new bikes, and you never put more than a few thousand on them, you might not worry about most of that... but if you actually USE the bike on a regular basis, any bike, than all this does apply. In a few years when the bikes are no longer new, they will be the same maintenance as any other bike, if not higher... after all, there are no manuals or aftermarket parts.
I know the zero might not eat headbearings like my ducati, or maybe the SS brakelines dont rub.. but you still have to check. I have literally worn out lever pivots and everything else on that list above.
In 230,000+ miles I have not had to do anything unusual to an engine, and have only had two fail. One had 240,000 miles on it. The other had a manafacturing defect and was replaced at 50,000+ miles with a brand new motor. Its usually one of the most reliable parts of the bike for me... Its almost always some strange, unexpected thing that has issues.