Bike Manufacturers Are Making Bikes Less Repairable

Lithium ion batteries and battery modules are never ever gonna be user repairable. The main reason is that the electrolyte is a highly toxic, carcinogenic and extremely flammable organic solvent. AAs are user swappable because the electrolyte is water based.

Bikes started being less repairable when manufacturers noticed that steel frame 10 speeds were lasting multiple decades. If parts continue to be available, those frames are still going to be in use another 50 years from now. Particularly where cartridge bearings are used.

Carbon fiber bikes are part of the trend. Will we eventually see a straight up plastic adult bike frame?

Lion cell electrolytes are nowhere near as toxic as those of NiCd or lead-acid. Flammability is the biggest risk. Toxicity is comparable to acetone.

https://en.wikipedia.org/wiki/Propylene_carbonate

https://en.wikipedia.org/wiki/Diethyl_carbonate

https://en.wikipedia.org/wiki/Ethyl_acetate

Yes, but unless you drink the lead acid battery acid, you're not exposed to it. Ditto for NiCd. No one is drinking battery electrolyte. The key is that all of the above in Lithium ion are VOC and highly available, including what you mentioned and worse, specifically NMP.

People are talking about replacing cells within packs, not disassembling the cells themselves!