The Don't Guess the System policy is still an issue.
The don't guess policy discussion has gone to gone to ground after resurfacing in spring of 2020 but I think it continues to be a divisive issue behind the scenes (how can a topic with that kind of answer, comment, and view load not be?) and opinion may be shifting.
The last major update to that meta, in April of 2020, stated that the highest rated answer indicated that the policy should not be reverted. Since that April update, an answer expressing the opposite opinion has moved into first place, though only barely.
While the "maintain the policy" crowd had more answers (4 to 2 by my count) and won the early voting on the issue in that latest question, it seems to me that a great many "change the policy" people simply decided it wasn't worth their while to write an answer, voted their opinion, and moved on. Or perhaps I'm projecting.
In light of the fact that about 9 out of 10 questions on the RPGSE are about D&D and nearly 43% are about D&D's 5th edition specifically, I foresee this continuing to be an issue until such time 6th edition is released...and then we'll probably have the same discussion again.