Thanks for this and I'm on the same page.
Son and Kane are elite, a coaches job at a club like Spurs is to improve that player at the level or 2 below. Conte's success generally comes when he's working with the very best. His appointment was misguided and that was on Levy.
I think the success the club is meant to be aiming for means you have to buy elite level players. I don't think any club has had sustained success at the top level without regularly spending a lot of money to do so. Spending money on its own isn't a guarantee of success but it seems to be a necessary part of it.