Hey Dakman, Welcome.
I'm sure others will chime in, So take this as only MY opininion. And my short answer is, it depends on how good YOU are.
Now, The long answer. MOST of the time it's very difficult to get the rear sprocket PERFECT. The tensioner allows you to make minut ajustments to the chain. I prefer to leave the chain a little loose (ya noticed I said a LITTLE) rather than too tight, And the tensioner helps with that and also with chain strech. A new chain will strech some.( not a lot, just some.)
Now, back to my short answer. If you feel you can get the engine to rear sprocket alingnement PERFECT. AND the sprocket centered PERFECTLY on the hub, Then I say give it a shot. Harley, Honda and Yamaha make all their bikes this way. I've also found that on a lot of bikes the chain won't clear the frame without a tensioner. Check out your clearence issues and if it works, It works.
Thanks, Big Red.