I recently suffered a serious injury to my support hand (left) but continued with my training as well as I could (who doesn't practice dominant one handed shooting ?).
We train regularly with support hand in anticipation of the loss of the use of dominant hand, but was amazed at the difficulty encountered by the dominant hand alone with the loss of support hand !
Inserting a magazine into a firearm, much less loading the magazine itself can be a challenge.

Try taping your support side hand in a ball, stand in the middle of the room and do your thing.
Load your pistol mag (with blanks !) and insert it.
Now rack it and fire
Now make it safe.

Now try that with your AR, AK, Tavor or long arm of choice.
Fun Eh ?
Even more fun dropping and picking up the cartridge while holding the gun, FTF/FTE or failure in general.

(Wheel guns and bolt action are a bit easier as there is no spring(s) to contend with, +1 for Tom

).
If you get somewhere you can livefire this safely, I'm sure it will be a real eye opener, especially when timed.
Just something new to practice kiddo's