How are they forcing developers? If developers don't think it's worth it to make their game compatible with Steam Deck, can't they just avoid doing that?
the only platforms I've ever heard of this for were Windows Phone and the Epic Store
both of which were runaway commercial successes
These days the only context I hear "Playstation exclusive" in comes from people trying to analyze how much money Sony lost developing Concord.
Astro Bot is a personal favorite too. That one would be tricky to get the true experience on in terms of PC platform.
Neither one of them is a system-seller though. I don't think anyone feels FOMO because they missed the Day 1 release of Gran Turismo, or didn't play Astro Bot with 7.1 Surround and HD haptics. Bloodborne was a magnum opus, Persona 5 had people lining up outside Best Buy to reserve a copy. The PS5 exclusive library is down right impoverished by comparison, to say nothing of the PC exclusives it lacks.