I used to be one of those people who said 'too many United guests, let's have a bit of diversity' but honestly, my least favourite episodes have been when they've had non-United guests on like Rafa, JJ Watt etc.
I feel like the show works because of the casual nature of the conversations and banter. The episodes just fall flat when its more serious questions and answers. Scholes' personality is proper dull though, so he probably isn't going to be a good addition for a non-United fan like me, but I would still rather that than Rafa for example, because all the people around the table have some kind of relationship with Scholes and the casual vibes can continue to flow as usual, which is one of the show's biggest selling points.