I think whenever Ludia rebalances creatures they should at least have the decency to allow boost resets. If not for all creatures, at least for the affected dinos (which have been nerfed or buffed).
Worst thing that can happen is having boosted your dino to hell (say Thor or M_Rhino) then its nerfed and you’re stuck with boosts on a now useless dino.
Hence Its only fare to allow boost reshuffle with every rebalancing. Afterall since the game became boost-centric, many people spend hard cash of these boosts.