I build all all of my bikes without the roller tensioners... It's the only way to go!
I use special made shims that fit between the engine & rear mount to move the engine forward.
It's true that when a bike is new, the chain will stretch a bit & the sprocket will also wear in; so you can just add another shim to adjust when needed; but after some riding time, it will not need it for a good long time.
I have bikes that are daily riders & have been on the road for years using this method!