I don’t think it’s as big of an issue as you’re suggesting.
Disney has been very wise in that their BG system doesn’t prioritize who’s in the park first, because you’re correct that many people don’t get into the park remotely in proportion to the time they arrived (more on that in a minute). Other than Sunday, Jan. 26, though, when the backup didn’t clear by park open, it hasn’t mattered. The fact that they’ve suspended photos at morning park entrance is HUGE and I credit them for that.
The planter placement makes it impossible for the lines to be truly orderly. On Sunday, my husband, daughter, and I got into three different lines to see how they behaved. The line I was in, near the right facing DL, won by a MILE. First, they opened the park gates off to the side (by the strollers), so tons of people fled over there. Then, the line I was in turned out to feed into a space between planters and actually was hitting FIVE turnstiles. Super lucky!
Then you’ve got families joining their group after fetching Starbucks, people meeting up after getting separated at security... it’s just a lot of movement, even with no one intentionally “cutting” or anything.
So I got into the park while they were still behind the monorail track... but it didn’t actually matter because we were all in by 7:40, plenty of time to get a BG. THIS is the key point. I was very concerned about the inequitable entrance procedures at DL prior to ROTR opening, but it just hasn’t been a problem. Thank goodness!