What's the point of signing Bruno if Arteta WON'T rest Rice?!

If they can't come on and do what Declan Rice is doing, why did we sign Bruno? Why did we sign him? I thought it was very strange, some of his substitutions. I'm not having a go at him or criticising. I think at the end of the day, I just look at him and go, you know, you need to do a little bit better with that rotation and all that. And at the end of the day, you play a Champions League game, you're 2-0 up, you've got Myles Lewis-Skilley and Bruno on the bench. If they can't come on and do what Declan Rice is doing, why did we sign Bruno? Why did we sign him? I don't get it. I actually thought we'd sign Bruno sometimes to stop Declan Rice having to do what he'd done yesterday, like give him a bit of a break. Thank you, Mike. I know Robbie's going to come back now, it's only November and all that, but I want Declan Rice sharp and at his best from March onwards. Not knackered in March because of what he's doing now. We know England's coming up in a couple of weeks or a week's time. He's going to play in both of those games. I just didn't understand some of the substitutions yesterday.