Let`s take a look at advanced statistics:
Regular season 2022-2023
Hintz
TOI 17.33min/gp 73gp 37g 38a 75p +31
CF% 60.7 FF% 60.4 Ozs 65.4% Oigf 124 Oiga 54 G/60 1.7 A/60 1.8 FO% 52
Matthews
TOI 20.17min/gp 74gp 40g 45a 85p +31
CF% 60.1 FF% 61.3 Ozs 74.3% Oigf 137 Oiga 56 G/60 1.6 A/60 1.8 FO% 52.4
As you can see they are as close as 2 players can be in all other aspects than payroll. Hintz even have a better G760, so spare me with that "Matthews is a much better scorer". Dallas play their lines evenly and that is what sets Hintz`s production lower.
Then playoffs 2022-2023
Hintz
TOI 18.26min/gp 13gp 9g 10a 19p +5
CF% 63.9 FF% 64.1 Ozs 64.7% Oigf 23 Oiga 8 FO% 60.0
Matthews
TOI 22.52min/gp 11gp 5g 6a 11p +2
CF% 60.0 FF % 62.6 Ozs 74.4% Oigf 16 Oiga 8 FO% 52.9
Could have dug up even more stats, but I think you get the point? Also, in the playoffs Hintz has actually done even better when separated from Robertson. It`s JRob`s stats that took a dive. Let`s try Matthews without Marner?
I still pick AM he is simply the better player and as for the Cap difference most people voting Hintz are assuming the best players at that salary right now not the average player at that cap rate.
^Care to check?