Lithium mostly exists as pouch cells in consumer devices, standardized batteries in general are rare. AA/AAA is mostly used on extremely cheap stuff, or stuff that one expects to last 5 years or more so nobody cares about recharging.

I hope we eventually get a consumer friendly standard for lithium though. It could be so much better than cylindrical cells, we could have all our cheap gadgets using micro versions of the power tool slide on shoe concept or something. Kinda unbelievable the ISO isn't trying to standardize prismatic type cells.