Someone PICKING high stats rather than rolling high stats. It's not a problem with high stats. If I were in a game and rolled as 12's and you rolled all 18's, I wouldn't care in the least. If I rolled all 12's and you just picked all 18's, I would have a major problem with it.
If no one cares, then no one cares. I'm approaching it from the viewpoint of one person wanting to cheat their way into better stats. If they have to cheat to do it, then by default the others care. Otherwise it wouldn't be cheating.
(y)
I found that to be true in prior editions, but in 5e bonuses from stats don't mean nearly as much. I've not found it an issue to challenge a party with varying stats.
The DM. You're the DM. It's not an isolated thing. If you have 4 players who roll stats and keep the stats they rolled and one person cheats to get those two 18s, two 14s, a 16 and a 12, it diminishes everyone else at the table. It's not about making that person happy by allowing cheating...
Yes, buuuut... I rated them based on 1) how much I would have to refer back to my other stuff, and 2) the changes made to the settings. The less I would have to refer to my older materials and the more changes were made to the core of the settings, the lower the rating.
Their concerns are not entirely unfounded. We have seen, even in 5.5e, changes that indicate that sensitive topics are still something they are willing to change. Altering the pictures and text of some creatures regarding gender, comments in the past about slavery, etc. Enough change to these...