Earlier quoted context omitted.
Festool's Domino system is the one product I cannot find a cheaper alternative (too pricey for me though, so sticking with my biscuit joiner). I'm very happy with my Makita track saw though that, while still pricey, was maybe 1/3 the cost of the Festool?
Coincidentally, just last night I watched this video from Stumpy Nubs showing how to create loose tenon joinery without the Domino. Of course, it does have some complexities, and assumes you have a table saw and plunge router. https://m.youtube.com/watch?v=Bx1Mg2mTMO0
It's hard to describe just how much more useful the tool is compared to router jigs, pocket holes, etc. It changed how I design my work, how I prepare rough stock and cut it to final size, and how I work with wood movement.
[1] though I have the Seneca adapters and all that, I wish I had gotten the smaller one. Unless you're doing serious structural joinery the smaller Domino is much more convenient, and you can double up on tenons instead of reaching for a bigger one in most cases anyway.