My suggestion is to click to account settings, untick your junk settings and then click to 'global junk settings' and untick that as well. I also suggest you log into your account online, as some email hosts also do junk filtering.

I'm just wondering if I can delete my TB Junk folder?

I just want it all to go to my Inbox and I can delete on the fly rather than moving both ways as mentioned above.

TB is a very refreshing change from my webmail interface but this un-trainable Junk Mail filter really is unbearable.

I've run lots of email platforms and am not a stranger to training the junk filter but this one really is unbearable especially since running through email everyday is pretty much a part time job these days with deleting being a massive portion of it.

I have my email filtered at SiteGround where it comes through but now I'm having to keep 3 browser tabs pulled up to go there regularly to see what I'm missing.

If I delete my TB Junk mail folder would things slipping through as junk just not come at all? Seems like that may have happened but maybe just me, trying to fix 3 accts and running back and forth to SiteGround also looking there.

I have everything Junk un-ticked and un-enabled even in Global.

Puzzling. Something you might try is creating a filter to run after junk classification and change junk status to not junk.