A single shooting discipline conducted on a flat grassy range in good weather for recreational purposes, no. I can't think of any fun and games where muzzle discipline is ignored.
Work as an LEO or in a combat unit in the Army and you will get over it quickly. It's not that you don't pay it any attention, no, it's very much part and parcel of the skills you try to practice. But there is also a very real reliance on team work and trust along with the mandatory execution of the task at hand. You don't get to call a time out while the Range Safety officer lectures you on muzzle discipline when the opposing force is actually trying to maim or kill you by direct fire.
Hence some of us have a slightly biased attitude about it. Goes with the expression we state with curled index finger - "this is my safety."
There are plenty of ranges and courses of instruction where the gun handler is loaded and locked at all times - not dangling an inoperative weapon broken open with the muzzle pointing down. And I also note that despite our best efforts, we do lose about 1 special operations soldier annually just practicing live fire annually. That doesn't make the loss acceptable, but the intent is to prevent doing it in a mission and to gain the team work necessary to keep that loss from being even higher.
And the volunteers for that level of risk are standing ten deep in the application line.
We have different levels of risk acceptance and for the most part may never agree on it - just keep in mind the ones that do accept a lot higher risk are the ones protecting our rights to disagree.
BTW I carried my CCW in a shoulder holster on a trip to Myrtle Beach this summer, even wore it on the beach when I knew I wasn't getting in the surf. I probably muzzled thousands of people over seven days. And I likely got muzzled more than once daily, too, because concealed is concealed. There are literally thousands of CCW in this county, plus LEO, and open carry is legal. I get muzzled daily at work - all with holstered handguns.
Work in a team with loaded weapons and it becomes a very cooperative and mutually respectful atmosphere where everyone is intent on being better at it, knowing that no matter how good we may get, things will change and we will need to accept risk. Live gun handling is entirely different than range gun recreational exercises.