Valve seems to have a slow pace for a reason...

With games, you seem to have two choices...

Do you want a game now, or a genre defining masterpiece that maintains playability for a decade later?

I have an unpopular opinion about Portal 2 that seems relevant here. I just don't think it was that groundbreaking. Sure, it was a fine game, but it felt more like Portal: Episode 1 (in the vein of the HL2 content packs) than it did a proper sequel. I don't recall it adding any truly meaningful/groundbreaking gameplay mechanics. Portal blew my mind the first few times I played it, and I couldn't get enough of it. The only other games within at least the past decade that also did that for me were KSP and Minecraft. Portal 2 just felt like a content pack, with admittedly well fleshed-out characters. Am I missing something? I mean, I guess the coop puzzles were cool.

Now an actual Half-Life 3 in VR, on the other hand ... if executed properly that would literally go into the history books as launching the entire next generation of gaming, more different in kind than even the original transition from sprite-based to truly 3D-rendered environments.