Some keyless Irish flutes are patterned after Pratten, and could therefore be described as prattened. Traversos aren’t, ipso facto they must not be session cannons and by extension could likely be considered very quiet by some (but loud enough for orchestral work).
There’s a school of thought that suggests the tuning of Traversos was pretty much ratpoop and so great skill on behalf of the player was needed when performing with other musicians ensemble, not just to blend in with the other instruments, but to play in tune with everybody else. According to a great body of opinion here, none of that seems to be a requirement where the playing of Irish flutes is concerned.
When Traversos were contemporary instruments, those poor players really only had one tutorial to work with, a sizeable tome containing too few pages on flute-playing, written by a bloke called Quantz. Not only did Quantz write appalling English, full of chuddy ƒpelling mistakes, but he would inƒiƒt on such naffitudes as tonguing, and practice. Whereas for the Irish flute today, there are a great many tutorials available, tonguing isn’t necessary, and usually after about the first three pages you’re into “500 tunes”, so the emphasis is more on learning tunes than practice, which is cool.
You can see a picture of Quantz and buy his book here (for although he’s been brown bread for a while now he has a pretty good web presence): http://www.flutehistory.com/Players/Johann_Joachim_Quantz/index.php3#Quantzbook
Of course it doesn’t help that Traversos were made and invented back before modern concert pitch was standardised at A=440. So the whacky tuning of a Traverso is made even whackier by it being made to a pitch of A=415. Or thereabouts. Depending on who plays in your local session though, maybe no-one would notice if you took a Traverso along to join in on The Tarbolton set. But if you took your Tipple or McGee to a Traverso session (where they still have fiddlers but fewer bodhrans) they’d definitely notice.
How does the traverso compare to the keyless Irish flute that we’re primarily concerned with here? Well, given the foregoing, apart from having the same number of finger-holes, it probably doesn’t. I’d buy one, but then I’d feel obliged to learn that cromagnetic classical music for it and I have enough trouble with the diatronic stuff and not-tonguing.