I agree, but I haven't played enough 1 vs. 1 this year to know whether or not the defensive AI is like it was last year; in 2K17, you had to turn the off-ball pressure all the way up to "deny" to keep your defenders from leaving shooters open and running over to help inside, even if you had "no help" turned on. It took a combination of "deny" and "no help" to keep shooters covered, because "moderate" or "tight" plus "no help" would still result in your defenders leaving shooters open to help inside.
If the "no help" setting works by itself this year regardless of what you have your off-ball pressure set to (I can't speak on that issue with my limited 1 vs. 1 experience in 2K18), then "denying" everyone off-ball shouldn't be necessary any more.
If you're talking about a 5-out isolation offense, there are possessions at all levels of basketball where that will happen, it just doesn't happen during every single possession for an entire game like it does in online matches of 2K.
If you're talking about a 5-out motion offense -- which I wish was in 2K, but isn't -- that is much more common in real basketball, and is even some teams' primary offensive system, especially in high school and lower grades where teams might not have any tall/strong players who are worth keeping around the basket for rebounding/scoring opportunities.
The first offense I was taught way back in 4th and 5th grade was a 5-out motion system. In high school, our coach ran three different types of 5-out motion sets, each with different spacing, rules, and reads. And I've watched Vanderbilt University's basketball teams (whose rosters are typically strong on shooters and weak on big body rebounders/post scorers) run plenty of 5-out motion sets over the years in Nashville.
The spacing itself (5 guys outside the arc, or alternatively, 5 guys above the free throw line) is very much a part of basketball, it's just the isolation part that you won't see much of these days, as isolation plays in general have fallen out of favor, with off-ball motion and pick and rolls becoming much more popular at all levels of hoops.
Removing the regular 5-out might have caused more problems than it solved if people are now going to start their point guard at center to continue running 5-out.
That will just create more pause menu busywork for normal 2K players to get the defensive matchups and settings correctly assigned.
Yep that's why I think the better solution, instead of removing 5-out, is to add an anti 5-out defensive point of emphasis. My understanding of the POE system is that it's basically a bunch of predetermined settings that override whatever you've manually setup? If so, that would give casual players the ability to make just three or four button presses in the middle of the game and easily stop 5-out offenses without having to pause the game and adjust a bunch of settings that might be confusing to them.