This is my first post on FOG, a site I find most useful.
Thinking back to 1948 I do not remember ever owning a dado set. I know I owned a router before I had space for a table saw. Then in January 2006 I decided to visit the store of a long time friend. This is Eagle Tool of Los Angeles. There I came face to face with Festools. I was actually shopping for a new table saw, but realized the TS55 consistently made glue-ready cuts. The guide-rails eliminated the space required for a table saw when reducing sheet goods, and with improved dust collection. I bought 2 extra 1400 rails and a CT22. A few days later I bought an OF1400 and a 36mm hose, with the attachment so it worked with guide-rails.
I also own and love the OF2200, but have yet to need its power for 19mm dados or rabbits. Since the Domino I make fewer dados.
My OF1010 is nearly always attached to the device spacing 5mm holes on 32mm centers. I am sure it would also work fine for dados up to 19mm, but perhaps not in a single pass. The MFK700 trim router also works very well for me.
When I started to equip my new shop, I asked about dado sets for use on large slider saws. The rep for the brand I selected has not sold the dado set in his entire career. I did buy a table router a few years ago, which is a decent way to make routine fairly short dados and rabbits. These days in my shop I normally do as much routing and boring as possible on my CNC nested router. Thus the OF1400 and OF1010 get their chance out in the field.
Even in the shop I still find it convenient to make some cuts reducing sheet material with Festool guide-rails and the TS55, especially when my slider is set up for solid wood. Oh yes, my new beam saw gives me near-Festool quality glue ready edges. Think of guide-rails below the work, with a scoring blade as well as main blade. My slider also has a scoring blade.