That's fine, but sign them with an option then.
It does all come down to your scouting and the path to the first team. The reason I think it's a sensible approach to sign young players permanently is because a good Championship player goes for £10m, if you're signing a Robertson for a six figure fee as I've read, you don't need many to work for the strategy to be successful. Plus young players should command lower wages so we hopefully don't have to keep running an operating loss of £20m. They won't all work, fans are quick to write players off too so more patience would be needed, but we're seeing Simons and Longman beginning to look like decent players. Longman looked good in his first few months with us, but had a tough couple of years. Now he's looking more like the lad who joined just significantly bigger.
If you compare that to our approach of last season, we spent a lot of money on high-profile loans who didn't work out as expected. I'd include Giles, Vinagre, Twine and Zaroury in that. Yes, some loans worked (ironically some weren't high profile), but we're now left with nothing, it's a complete rebuild and our FFP position is damaged/hurt etc. It's just not a sustainable model.
I think LD is a loss too because he did provide us with some gems for a pittance.