Yeah, some of this is a semantics shell-game. If a player is 6'6" and plays SG/SF we can call them a guard or a wing depending on which fits our argument better but it doesn't change anything about how they play.
There has been a trend toward playing smaller, more athletic players at the 2-4 positions (traditionally called SG, SF, and PF) to compensate for the way that 3pt shooting has spread the floor out. Asking a slow-footed big to rotate and cover sideline to sideline on a swing pass is just not that practical and we are now in a world where few teams play a post-oriented big at that PF position so your defense needs to be ready to cover 4 shooters at once. That's also where the obsession with wingspan comes from but I see that focus on arm length as an oversimplification as well since anyone who is any good at it plays perimeter defense mostly with their feet.
The hardest part about NBA team defense in 2025 is figuring out how you're going to defend the interior and the 3pt line at the same time without conceding open baskets in one area or the other. The Kings under Mike Brown tended to collapse into the paint to help Domas stay out of foul trouble but that left them particularly vulnerable to kick-out threes. Which is a bit of a confusing strategy when you realize that Mike Brown's own offense was built around generating kick-out threes.
Makes me wonder what those practices were like since we had a defensive strategy tailor-made to make our own offense look good. For all the game-thread bellyaching about defensive schemes last season, I don't think this problem was solvable with the roster Monte McNair handed over to Coach Brown and it's not any more solvable with the current roster. In the Doug Christie at HC era, Valanciunas was the best (only?) defensive big we had and he's gone now. So Scott Perry may be setting Doug up to fail the same way Monte couldn't help Coach Brown. Could be good news for the tank though?