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I guess it's too hard for you to differenciate that there is too many genres on STRATEGY games. If i say i refer to strategy games i can be talking about RTS or RTT (real time tactics), turn based, grand strategy (HoI) or city building (Anno/Skylines). Guess what, MOBAs ARE strategy games, more focused on the action part (ARTS). You have MMORTS (Clash of clans) or Tower defense games. Finally even artillery (Worms) games are considered inside of the strategy genre.
The majority of the people who played RTS on the 90/00 had been basically absorbed by the MOBA genre (DOTA, LOL, SMITE, HOTS). The ones closer to RTS not something like Battlerite. Not talking about the hardcore players but more on the "casual" side.
I'll give it a clear comparison in another popular genre (FPS).
We have Quake. Skill base, 1v1 arena base FPS. Take a look on how the genre was 20 years ago and how it's now.
Team Fortress had basically the monopoly on the genre and then Overwatch comes and exponentially increases it, sprouting several simil games (Paladins).
Right now we have king of the hill games (PUBG/Fortnite).
Maybe in the next 10 years, simulation VR like games are the next boom.
Why do i care about sales? Because this means sequels, more, better, deeper after release content. Support. Patches. Features. I think no one expect Relic to release as much content for DoW3 as they did with CoH2. Think about the amount of things we would have, if we had a fifth of the SC2 playerbase.
About AoE4. I'll say that just by it's name, it's gonna sell millions but it's never gonna be a market game changer due to W10 way more than Window store. More than half the users on steam are not using W10. "Forcing" people to upgrade will only serve MS, not Relic/Sega. Having a dedicated platform for different games is no unusual practice nowadays. It's just another "icon".