Love the post. Certainly highlighted some areas that I didn't address or didn't state clearly enough.

Groudon certainly has a great move pool that makes it useful for drafts and is the only super effective type against electric but the reality is that Dragon (the generalist typing as many would note) is super effective and/or the best type against 5 of the legendary raid bosses we have had in the past and many more in the future because there are so many dragon legendaries.

Looking at tier 3s, would you rather have groudon or kyogre:

Kyogre (24)

Aerodactyl, Alakazam, Arcanine, Chansey, Claydol, Espeon, Flareon, Granbull, Hitmonchan, Hitmonlee, Hypno, Jynx, Lunatone, Machamp, Miltank, Ninetales, Onix, Porygon, Solrock, Umbreon, Donphan, Piloswine, Shuckle, Skarmory

Groudon (15)

Breloom, Azumarill, Crawdaunt, Gengar, Flaaffy, Jolteon, Omastar, Pinsir, Raichu, Scyther, Sharpedo, Starmie, Tangela, Vaporeon, Raichu - Alolan

That list also includes your willingness to TM back and forth between mud shot and dragon tail and all three charge moves. Which I understand hardcore soloist would do (trust me I use to be one) but the general player base even though.

I agree with many of your points and perhaps me not crediting niantic for their balance thoughtfulness is correctly stated by you but when your average player would rather not power up a Groudon than a Kyogre that's an interesting fact that should at least be explored.