I remember them saying that they dont want to do another one in the series because they are looking to innovate and make something truly original.
I don't remember them saying this, but I remember people speculating that this was a reason. The truth is, if you look into The Final Hours of Half-Life: Alyx, they prototyped a bunch of different single player games that were cancelled because they just weren't working, including Half-Life 3. Post-Alyx, in recent weeks, we have evidence to suggest that Half-Life 3 may be imminent.
It’s true they’ve always been distracted with multiplayer games as well, things like Counter-Strike or Team Fortress and I did play them for sure, because I was a kid and I had all the time in the world.
These days I’m not a kid anymore and so when I game I tend to look more for memorable experiences instead of mindless grinding.
Boy, I miss the days when multiplayer games didn't mean mindless grinding. I play fighting games, and the mindless grinding in recent releases is siloed off to a separate mode that I don't have to think about; otherwise you're playing the game because it's fun and/or because you want to get better at it, not unlock the latest costume. I would love nothing more than for campaign FPS games to come back--the kind that postdated the designs of what we now call boomer shooters--and to come with a deathmatch/CTF mode made out of levels recycled from the campaign, playable online and local. You'd play that multiplayer mode for maybe 5 hours or maybe 5000 hours, depending on how much magic they managed to capture in it, but you absolutely would not have some expectation that the devs must keep updating it. Those were good times, and I didn't appreciate how good we had it.