Maybe I didn't articulate my point well:
The trade itself is fine IMO because Hill, while very good, isn't going to turn into one of those "holy sh*t we messed up trades". So in a bubble, the trade is fine and the spurs don't really miss when it's in the lottery range (weak draft or not). We won't know if Leonard is solid until he plays but even if he's a bust it doesn't set any thing back in a major way. It will be a blow to both contending and rebuilding but not a massive one either way.
But things don't happen in a bubble so the issue is if you gave up a rotation player on a contending team for some 19 year olds that might not be ready to contribute (maybe too young) or might not get an opportunity (RJ can't be moved) then you likely stayed put or moved backwards from a contention standpoint.
I know there is time, but swapping young player for young player doesn't really send you full steam into rebuild mode while at the same time it doesn't look to help you push forward from a contention stand point.
Thats all I said about the situation. Not that I hate the trade itself, it's just that when you move a young productive rotational asset, you would like to see it clearly be on a path to accomplish something either way (rebuild or contend).
Still plenty of time to go either way, but when evaluating this draft which is what happened, there are no real answers to anything.