I don't think there's any way around it though. Faster charging trumps larger capacity I think.
This!
Yes, we (still) need bigger batteries because I do think that 150-200 km at highway speed (130 km/h) should be easily possible in the future. And even the Energica's 21,5 kWh pack is hard pressed to reach that without draining the battery to the very limit unless conditions are perfect.
But, apart from this I think that we will follow what the car industry is doing for quite some time already: Favor high charge speed instead of growing battery capacity ad infinitum.
While the jump from the 28 kWh of my IONIQ to the 64 kWh of the Kona was quite a leap forward, the next upgrade to the Model 3 with 75 (or nowadays 82 kWh) does not change much in regards to how I drive. The range is plenty and I usually need a stop much earlier than my car.
Eventually we will reach that state with bikes as well. It feels like we are trailing the cars by about 4-5 years or so.
And looking at my car which reaches a peak charging speed of 250 kW and an average charge speed of ~125 kW (0-80 %) that means we already have charging speeds of 1,7 (avg) to 3,4 C (peak) for our cars. And I can sustainably reach that, even in hot weather.
So, if we manage to squeeze about 20 kWh of net capacity (needed for 150-200 km of highway range) into a bike then this would mean we should reach a charging speed of 34-68 kW with today's cars technology. Well, the Model 3 is on the market for 3 years already.
Given the 4-5 years delay that I assume between cars and bikes, we could expect to see bikes like this appear in the market in 2022 or 2023. Not so far away as it seems.
Question is: Do they manage to squeeze the car's technology into the form factor and weight limitation a bike has?
I guess: It should be possible. and considering that the current battery pack from Zero (14,4 kWh) is essentially 3 years old already, one could assume that the next leap forward is to be expected quite soon.
And Energica will not stop and watch either. Their CCS capable packs are not too new either (even though the 21,5 kWh pack is). So, an upgrade to the achievable charging speed with a very moderate update to the capacity is not completly unrealistic here.