It looks like they are following the latest market rage of light-lighter-lightest. I guess that's fine for those concerned about total weight of the bike. But for myself, a happy owner of a 2016 model year PW drive system with no problems, it'd be nice if Yamaha would look at backwards-compatible upgrades in higher capacity batteries for their older PW drives that are still out there, running strong in 2022. Their last upgrade like that was when they put the 500wh external battery out on the market. Meanwhile, there is a German battery maker that has designed and built a 745wh external battery that has been on the market for at least 3-4 years now. But it's not readily available to the North American markets.
Do I expect Yamaha to look into upgrading drive systems no longer in their current catalog? No, not really. But I can dream!