Again, this is not how football works. I've seen similar inferences in this thread regarding Pogba and Bruno too with things like 'how can you compare x who gets this many goals and assists to y?'. Not everyone is in the team for the same purpose. Fred is simply a better defensive midfielder than Scott, and perhaps that is what is valued more at the time. It's not always about who provides the bigger threat.
But footy is about opinions, I don't agree that McTominay is amongst our most consistent players. He's probably amongst the most loved though, which is why a recent spell of good form has stuck - but he's up and down in my view.
To be fair to players like Bruno and Rashford - I think consistency is probably harder in their roles than it is for a full-back for example. But it's tricky to equate goals with consistency. Rashford has our second highest numbers but to say he is a consistent performer would be a stretch. He's more likely to score a goal than he is to have a 'good game' - although maybe scoring a goal means he had a good game?
I don’t need anybody to tell me what is patently obvious: Maguire is a fairly good CB for whom we grossly overpaid. There is nothing about him that makes him a top, top CB. You need to grow up.