Since we might not get the existing mega evolutions in this game, do you think we'll get the existing mega evolutions just rebranded as Gigantamaxed Pokemon? I hope so, otherwise this will be the first time Pokemon forms (outside of Shadow Lugia and Spiky-Eared Pichu) will relegated to the dustbin of history, which will be sad. (That or maybe mega evolutions could be turned into aesthetic forms of the normal Pokemon, but stay around outside of battle (that would be quite awesome and I'd be very happy with that))
But I'm also sort of with AshCo on some of these Gigantamax forms, in that I'd prefer them as standard evolutions, mostly because the whole oversized look ruins their appearance imo and especially because I don't want to see them disappear like Mega Evolutions might when the Dynamax and Gigantamax mechanics inevitably die off and get replaced.
Edit: Not to mention that you can only Gigantamax Pokemon that you caught in raid battles so if you want to Gigantamax a Drednaw or Alcremie, you can't breed for it, you have to catch it in a raid battle, which means that we best hope that bottle caps and Hyper Training return in Gen 8 (which they should), otherwise this fact essentially renders the Gigantamax Pokemon competitively unusable until someone releases software (or something like an action replay) for us to edit our Pokemon stats like we currently have for the 3DS (this is, of course, if the Pokemon is usable even with its best stats) (also, if Pokemon caught in Dynamax Raid Battles are guaranteed 3 Max IVs like Legendary Pokemon, this might actually mostly offset the problem).
Edit 2: After reading some more, is it that only the Pokemon caught in Dynamax Raid Battles will be able to Gigantamax or that you can only catch Pokemon that can Gigantamax such as Alcremie, Corviknight and Drednaw through Max Raid Battles and not through normal wild Pokemon encounters? This is honestly confusing...
Edit 3: Nope, nevermind, it's the former thats correct. On the Pokemon website it states "Regular Drednaw and Corviknight can Dynamax, but there are some special members of these species that can Gigantamax. You can catch Gigantamax Pokémon for your team by participating in Max Raid Battles, but it seems they’re very rare—finding one won’t be easy!" This means that, unless Hyper Training comes back, Gigantamax Pokemon may very well be competitively useless (unless this "special thing" that makes a Pokemon able to Gigantamax is transferable through breeding, but I highly doubt it, and even if Hyper Training does come back, it still means that Gigantmax Pokemon won't have access to Egg Moves or Hidden Abilities, which may mean the difference between usable and useless).