It's such terrible roster construction and lineup management if your goal is to win, which is what the goal seems to be. Domas is not a great defender, so the point of attack needs to be locked down to prevent Domas from overextending himself at the rim, where he's not remotely effective as a deterrent.
The most ridiculous part of this is that the Kings actually have a bunch of strong perimeter defenders. They just don't give them consistent minutes. And they rarely play them together.
Carter
Ellis
Nique
Murray
Sabonis
That's not a winning starting unit in the West, but it's a lineup that understands how to compensate for some of Sabonis' weaknesses as a defender by keeping him from having to cover every single blow-by. Obviously, Keegan is still out injured, and that has a larger impact than it should on the Kings' ability to perform at all defensively. But when he returns, we're still likely to see regular use of lineups that ultimately funnel the opposition to the rim, where Domas gets exposed and embarrassed.