I don't think we should sacrifice the innovation and development of an entire industry on the backs of a tiny vocal niche of people who claim they want to repair their own batteries. If there was some standard form factor the entire last decade of the e-bike industry would never have happened. We'd be stuck with the Yamaha/Bosch/Shimano-style battery pack sitting inside the triangle, and we would not have the superior integrated systems of Trek and Specialized.
This isn't about about repairing batteries (eg replacing individual cells). Almost no one wants to do that, and that isn't the primary problem with reparability when it comes to ebikes. People want to be able to replace the battery, and do other repairs on the system themselves or with non-authorized repair shops, using high quality 3rd-party parts.
Many manufacturers make this difficult or impossible on purpose, and apparently they also have lobbied to change legislation to continue being able to do this, using battery fires as an excuse to cement their parts and repairs monopoly. It's that simple.
Let them innovate where they provide value - in the bike mechanics and drivetrain. But all their batteries are basically the same, built with same li-ion cells from same group of producers. The only innovation here is a proprietary chip making sure you buy only original replacement.
