It’s useful to remember that “Super Tuscans” is just a catch-all for any wine from Tuscany that doesn’t fall into, or would fall into but voluntarily chooses not to accept, one of the regulatory category labels.
Some of them are wines like Flaccianello and Ceparello which are 100% Sangiovese and could (now) be labeled as Chianti, but choose not to. Their wine may be more “traditional” than many Chianti, which often have international varieties and white wine grapes blended into them, both in spirit and in what the wine tastes like in the glass.
Also, many Super Tuscans are one-off bottlings made by producers who otherwise make traditional wines, and it gives the producer an interesting outlet to be creative in making something that might be really good. Castello de Paneretta, for example, is a 400+ year old traditional producer in Chianti, and they make a wine called the Quattrocentenario which I think is 100% sangiovese and really good, better than their Chianti wines. Uccelliera is a top winery in Montalcino which makes an interesting merlot blend called Rapace as one small bottling in their portfolio, and it’s reasonably priced and quite good in its own right.
I also find the idea of “native varieties” interesting. Merlot, for example, has been planted in Italy since at least the 19th century, maybe the 18th century, and it appears at least as a blending grape in many regions around Italy, including Chianti. Yes, making all-merlot wines like Galatrona and Masseto (both of which are excellent) in Tuscany is a newer phenomenon, but Merlot has been a player in Italian wine culture for a long time.
But even more than how long some varieties have been around, I like the idea of winemakers experimenting and discovering places where different varieties might produce good wines, and not being hung up on only planting what and where things have been done in the past. Sure, I don’t want Piedmont all planted over to Cabernet or something, but I like the idea of producers experimenting and learning. That’s probably how many of the “traditional” plantings ended up where they were in the first place.
I find it quite interesting the way in which varieties like merlot, cab and syrah can still have (most of the time if not always) a distinctive Tuscan character to them, how the terrior transcends variety to some significant degree. On Tuesday, I had a 1994 Castello di Ama Vigna l’Apparita, which is 100% merlot. I had it served blind, and it showed a strong Tuscan character, bright red fruit, high acids, excellent wine overall. It tasted more of Italy than of the variety, for sure.