A few years ago my circumstances changed dramatically overnight, my business went from a big fully equipped workshop to small double garage size premises with just a few power tools. I quickly bought a few cheap machines but went for a Domino 700 instead of a morticer.
I managed for a while with just the Domino but ended up getting a lovely big old cast iron Robinson morticer (for about a third of the price of the Domino #-o).
The Domino doesn't get used that much now, it is useful for some things but more often then not things get a proper m+t.
It all depends what you will be using it for. I normally use the Domino for cupboard doors and some internal joinery. I made quite a complicated greenhouse last year with some strange angles/shapes in it and the Domino was brilliant for that but most of my work is traditional doors and windows which lend themselves to a proper m+t.
It is an amazing bit of kit, I think one of the best tools available.
There’s nothing stopping you cutting traditional mortises with a domino after all it is a hand held mortiser, I use my 700 for mortises on big joinery I find it easier in a small shop to take the machine to the wood rather than the other way round, plus it freed up a lot of space when I got rid of my mortiser. I even do wedged mortise & tenons cutting the mortise with the domino then finishing with a chisel.
As Doug B says you can do traditional mortises and big stuff with the DF 700.
Here are my drive gates which I made to test out my DF 700 when I first got it, they were only meant to be temporary so didn't matter if they fell apart after a couple of years but they are still fine after over 5 years despite the lack of paint.
The top rail was a proper m+t using the Domino to cut the mortise but the middle and bottom rails were just joined to the stiles using dominos, standard beech ones which aren't really for external use.