I've been reading quite a bit of decent analysis on him recently and most agree, he's flexible, good on the ball and excellent off the ball, I've quoted a few articles below that show how he operates out in terms of beating the press.
You're right he's great at leading the press and disrupting DMs, but he's also very technically gifted and good on the ball finding space and moving it on quickly to progress attacks. What all the writers seem to agree on is that while he's not an out and out star player who will dictate the game, he is a flexible and very reliable cog in a system, in other words he doesn't have the potential of say Pogba when joined you, but he will progress the ball quickly, safely and reliably as well adding another facet to your attacking options. Off the ball he is a great presser and disrupter. I don't like comparisons as they're always a bit weak, but think of a press resistant Eriksen, but with more defensive output as well as the offensive skills.
coaches voice
https://www.coachesvoice.com/cv/mason-mount-chelsea-declan-rice-frank-lampard/
breaking the lines
https://breakingthelines.com/player-analysis/mason-mounts-meteoric-rise-for-club-and-country-2/
The football faithfull
https://thefootballfaithful.com/pla...proving-their-own-lack-of-football-knowledge/