Most DMs will roll a second time for 1's and 20's to see just how epic your fail or success was. This could be two tens for 01-00.
If the enemy steps on ball bearing and rolls a one...and then a second 01 is rolled...well than they might just break their neck and be laying there paralyzed and gurgling.
That's table top thinking...fuel for thought only.
If you replace "Most DMs" with "Some DMs" or "Most of my DMs," then sure. And confirming the crit (rolling again against the enemy AC to see if you actually get a critical - as Pathfinder calls it) does go a long way to limiting the nerf imposed on martials...but again this works better for Pathfinder where martials have a higher attack bonus than spellcasters. So it's less likely they'll get a low result on the second roll after adding their bonus.
If Larian were to implement critical effects, for martials' sake there should be some type of additional rule to offset the increased risk due to their multiple attacks. 1d20 + their hit die maybe? where a result < 10 is a confirmed bad effect? Idk, Hit Die is the only thing I can think of that martials have more of. I don't think the increased chance of a critical hit is worth the increased chance of critically failing and e.g., losing your weapon/taking an opportunity attack(s)/reduced AC for a round/etc.
Also, somewhat related, but crit damage is often homebrewed for exactly the reason @GM4Him brought up: sometimes you roll a 1 on both dice which is so underwhelming. Average of one (rounded up) damage die plus rolling the other is a balanced implementation. Max of one die plus rolling the other would be more appropriate for Powerful Crits.
