Honestly, I empathize with people who have these sentiments, but I fundamentally do not understand why people want new games from storied developers that don't think they have that great of a game to go into production/ship on. I'd love Valve to ship more games, and knowing they are working on quite a few (some in public knowledge, some not-so-much) is nice, but I'd much rather not play a Half Life 3 that they aren't really motivated to get to a shippable state.
Valve literally just released a new game late last year. It might not have been the game you (or frankly, many) people wanted to play, but it's the game they wanted to make and put into the world. They constantly & update the hell out of most of their titles, and are one of the very few big studios that not only allow modding & custom content, but go out of their way to support it. They're trying harder than anyone to get VR working, arguably in-spite of how viable a platform it is for mass market or revenue potential. They're pretty much the only "Linux" developer, both native & as a JIC Windows decides to go full App Store They don't allow a crunch culture, their average career lifespan is one of the highest in the west, and they legitimately go well out of their way to make experiences that make games fun irregardless of profitability. Valve is one of Riot's more storied competitors, and I can honestly say some of the criticisms thrown their way are legitimately befuddling.
Claims of "capitalism" killing the art just doesn't make sense looking at either Valve or other big publishers. They absolutely, positively have prioritized their live-service games & Steam, but not just because of the revenue-to-time economics - it's because those are the products that made their customers (players) the most satisfied, and those are the products the staff feels they are best worth investing in. They aren't perfect, god knows, but criticizing them for a lack of games shipped feels like the worst kind of monkey paw wish you could make of a developer you like.
I respect the opinions of (on a very personal level) anyone who's disappointed there's no Half Life 3, or new IP out of Valve in the same way I respect people that are upset the next Kojima game isn't a Metal Gear - you love something, and not getting more of what you know you love sucks.