dude look if they make a bad game, they lose money and learn to not make a game like that anymore. clearly enough people liked firewatch for it to be successful: why is it bad for valve to make a game like that? wouldnt it be worse if they didnt hire anyone new, and went and made a game like that, drawing developers away from the other games they could be developing?
and one important part about doing your job is being able to adapt to new projects. its not like if you can build a house well in BL, its all you can build well. a lot of those skills can carry over into other projects.