If any design is changed as a result of gov regulations I’ll eat my entire dick.
Is this you? Kinda looks like you.
What, exactly, did you expect when you said that? How did you anticipate people responding to the tone you set in your top level comment?
Couple pedantic points:
You can shoot 10mm with one hand, but you should be shooting pistols with both hands regardless of the power, because it's generally less stable to shoot one-handed. (Olympic shooting is one of the few disciplines that still uses single handed shooting.)
10mm was designed as a cartridge that would have similar performance to a .357 Magnum, but for an autoloading pistol so that you could reload faster and have higher magazine capacity. Typical 10mm loads outperform typical .357 Mag loads.
There's a pretty significant difference in .40S&W v. 9mm Luger; if you look at range ammo, 9mm 115gr will run at about 360 ft-lbs, and .40 S&W 165gr will run at about 470 ft-lbs. OTOH, a 10mm 180gr will run at around 710 ft-lbs. While the 1986 Miami shootout led the FBI to believe that they needed more stopping power than a 9mm, the all branches of the US Military still use 9mm, and most police forces have moved back to 9mm after using .40 S&W for a number of years.