some real world downsides (need to remember to charge/carry spare batteries around).
Unless you are off to ride for more than a week of 9+ hours of riding a day then that isn’t really a downside. Spare battery is always handy, but it isn’t needed for every ride. Charger isn’t a major hassle to pack either, but you do need to make sure you have access to power when you do need to recharge.
I don’t ride every day but I’m recharging the battery every 2 months, so it does seem to have plenty life in it.
Your concern seems to suggest you may be thinking it is like Apple products (and some other large screen smartphones) that need to be charged every single day…it isn’t. It also only really uses power when it is being used, so unless you are using it constantly whilst riding (as in raising and lowering it constantly and not just for adjusting for the terrain) then the charge lasts a good while.