The problem is knowing which altcoin will, in fact, remain supported. So many altcoins suddenly have a dev that leaves.
People are lost.
They either have to swap or the coin just fades away.
unequivocally, if the project does not have relevance in society, the coin will not represent any value either. Who needs dead weight? It is because of this distrust of certain projects, many users scatter such coins in the markets and therefore prices fall very quickly.