At current power levels of eMTBs (including Avinox) there's no need for active thermal management as it would unnecessary complicate things (not good for reliability), add weight and cost. It's not the battery that would get hot but rather the drive unit. For well established brands, most battery failures(or significant capacity fade) before 200 cycles happen because of external problems (shorts, water damage because of poor case design, BMS faults, or poor maintenance from the user). If newer and better cells are to be used (Dji already did that, not necessarily solid state), there's even less incentive for active temperature control.