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Nice first post.
I did see someone make a Blizzard comparison earlier, but it's a laughable one. Blizzard would never constantly redesign their factions and break abilities, nor make so many schoolboy errors with regards to basic localization and syntax. There used to be (andI assume still is) a running joke about CoH2 being designed as an e-sport, but there simply isn't the basis there for any kind of strict high-level competitive play. No serious RTS continuously redesigns factions/civs or core mechanics and expects the tournament crowd to take the game seriously.
Press X to doubt.
Let's ignore that Blizzard still actually develops and has devs working on their RTS titles.
SC2:
-I guess we are gonna forget that each DLC basically reworked each faction by introducing and removing units from their roster. Same with tech upgrades.
-Broodlord infestor meta. Archon toilet deathbball of doom. Bio only. I just had to mention it cause game back then and now are completely different beasts.
-Worker starter from 6 vs 12 made for completely different game.
-They constantly remove, introduce and rework spellcasters.
-2013 map design n meta =/= 2020 map design, mechanics and meta.
WC3:
-Let's remove the whole Reforged fiasco out of the equation and just focus on game mechanics.
-WC3 RoC from what i saw and post expansion are completely different games.
-Note: I'm sure someone like Tightrope could give a deeper and more detailed answer on this subject cause im fairly new (couple of years) following the scene (no idea about W3 RoC)
-From what little i know, Orc was "recently" reworked (moving units from tech structures), Necromancers (spellcaster unit) was reworked, Undead was given a healing item in their shop (they do not had one).
-"Viability" of factions constantly change, same with heroes (both their own faction or neutral tavern ones).
-Some people complain about the removal of Blizzard but the maps with the mechanic removed are still playable. Now think about how limited the type of maps on WC3 are when you can't use half of the settings because in 18 years you couldn't bother in balancing the mercs camps and items they drop.
AoE2:
Let's ignore the pseudo fiasco which was the steam version of AoE2 HD. There's a reason still use Voobly.
-In the same vein as WC3 RE breaking features that were working for vanilla WC3, same can be said for AoE2 DE. At least what i hear from biggest caster. It's still beyond better than what WC3 RE is though.
-While the core gameplay is rigid, it just means that smaller changes have bigger effects. Introduction of Meso civs, African, Slavs, Indian/SE asian, etc.
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https://www.ageofempires.com/support/aoe2/aoe2-issues/
Anything else is not worth comparing. Ex Westwood Grey goo or what is left of the C&C ip, even with the recent remaster. The fathers of the Supreme Commander with Planetary Annihilation. I think for the rest is a list of endless niche RTS. Cossacks, Rise, Empire earth, etc.