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it was a mistake/lazy to completely get rid of them. they could have retooled and adapted it for dynamax. At the very least they could have kept them in as simply form changes. no stat/ability/type changes
>How to bring back mega evolution in this regard:
option 1
you are given a megastone. it will work on any pokemon that is able to mega evolve, even giving you the option for the y megas. using it on a mega poke will revert it.
option 2
certain wild pokemon can have the x or y gene and it allows them to evolve into their mega form instead of the regular one (x gene wartortle to mega blastoise) pokemon that dont evolve like heracross can be found in their mega forms in the wild.