Ya pretty much the only argument Tom has about Mahomes has to do with longevity. The fact Brady did what he did for how long he did is fucking impressive.
Pretty much any per game/year stat favors Mahomes... For example, this year Mahomes passes Brady for post season wins sub age 30 and he is 28 right now. Pretty much any statistical category (yards, TDs passer rating, etc...) favors Mahomes on a per year basis. Mahomes in the playoffs down 7+ in the playoffs wins at an +80% clip and the next closest player is Brady at 42%.
I think what will be interesting is how he adjusts when Reid and Kelce retire.
I think he can absolutely get there and he doesn't even have to go to 45 or whatever Brady did.
Honestly if he keeps this pace up for another 8-10 it'd be tough to argue.
But you're certainly correct that in a lot of ways he beats Brady.
There's still 4 ways besides wins (which Tom did with 2 franchises btw) I like Tom better:
1) Reading a defense. There's simply nobody better ever.
2) Longevity as discussed
3) Tom did it with less offensive talent around him (but before this year Patty did it with less defensive talent)
4) Wife (or ex now I suppose)
Regardless I'm enjoying the ride. He's freaking incredible.