Yes, tapping that regenerative power will be a major step towards wheels directly geared to a clutchless motor which will then eliminate drive train losses. And I think alot of motors dont do regen in any major way yet.
The problem with regen is its too spiky and lithium ion charging doesnt like that unlike lead acid which can handle it, but using multiple battery options is becoming more normal. Cars fitted with stop start technology typically have an additional battery using either the newer cheaper Enhanced Cyclic Mat (ECM) batteries and the more older more expensive Absorbent Glass Mat (AGM) batteries, but they work.
The problem with regen is its too spiky and lithium ion charging doesnt like that unlike lead acid which can handle it, but using multiple battery options is becoming more normal. Cars fitted with stop start technology typically have an additional battery using either the newer cheaper Enhanced Cyclic Mat (ECM) batteries and the more older more expensive Absorbent Glass Mat (AGM) batteries, but they work.