I really don't understand why anyone is making saisons without brett.
I know this kind of got covered already, but this thread has been awesome to read and I think there's another element here that is important but was skipped over.
This is all highly subjective and just my opinion. As a brewer, it's much more difficult to make a Sacch-only saison that is on par with the great 2nd Wave saisons (Dupont Vieille and Avril, Thiriez Extra, Blaugies Saison D'Epeautre, Cuvee de Jonquilles, and I'd include De Ranke XX as well) than it is to make a solid Brett saison. It's also a lot harder to make an unblended tart/acidic saison that has prominent hop character (to mimic a "traditional" saison that might have been originally highly hopped but acidified over time) than it is to make an acidic beer that is just lightly/un-hopped (which I personally would never call a saison).
Secondary Brett fermentation can cover a lot of sins. That's why it's impressive to see the skill and attention to detail with brewers like HF who can pull off balanced, drinkable, clean (ie: non-Brett/lacto) saisons that aren't sweet, spiced/adjunct, isoamyl acetate messes, but really beautiful and exciting renditions of the great Belgian beers, AND also do drier/funkier/tart renderings. And why it's impressive to see brewers like TH who can do really expressive mixed fermentation beers that maintain insane balance and showcase brett and lactic character without overwhelming what is clearly a primary saison fermentation character.
Brewing a sub-5% hoppy non-brett saison which is dry, but has body, is hoppy, but balances a nice fermentation profile... that's difficult. One of many reasons Thiriez Extra is an absolute brewing coup. Totally brilliant beer.
I know some folks in this thread seem to have come up on the 3rd wave beers, but those 2nd wave beers I referenced above created the modern saison style and kept it alive. They were the first saisons that influenced and inspired most of the people who are brewing the new 3rd Wave of saisons. They might not be funk factories, but if you spend some time with them you'll find that they are soulful, phenomenal beers.