Well, you are right. I have never used Festool, but I do believe that I have analogous experiences. My job requires me to turn wrenches fairly often to keep equipment running in the field. As you might expect this leads to quite a few of my coworkers being devotees of snap-on, Mac, Matco, and the other high end tool makers. I am not. Yeah, there is a slight, marginal difference between a Mac socket set, and my Craftsman set, but my set gets the job done at 1/2 to 1/3 the price. Heck, I’ve found that so long as you buy the high line versions, Harbor Freight tools get the job done just fine too. Just don’t buy the cheapest version they offer.
I see where the Domino might be useful, but Rockler’s beadlock joinery system does the same thing for a way lower price, and let’s you bring the tool to the work too.
When Festool is willing to sell that Domino for under $300, I’ll be willing to consider it. You just can not justify $950 unless you are setting up an assembly line where a guy is going to bang out the same joint over and over 8 hours a day.