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Maybe technology-wise, but the games are all super expensive and there aren't enough of them to justify a subscription.

You don't need a subscription, it's free to play games you buy. The subscription gives 4k and surround sound + free games.

The current sale matches steam for the games I checked.

Library size is still a concern.

Yes I know. I didn't imply otherwise. The games are too expensive to buy outright (IMO) and too few to justify a subscription.