I mean absolutely start reading your TBR.

But there's nothing that says that you can't do both. If it makes you happy is there anything wrong with it? Obviously don't bankrupt yourself, and as far as I'm concerned living spaces are to be lived in, if you've got the space for them. Fill it. And then find another space and fill that one.

I've always maintained that book collecting and book reading are two different hobbies.

I'm currently running at about a 400 book deficit, with a collection somewhere over 1700, (currently between cataloguing apps), if that makes you feel any better.

If you've got the space, and this is something that makes you happy, welcome to book collecting, we're a bit of an odd bunch, but you're gonna have a great time!