Core is so clever you don’t really need FM! You can use a 3 pos switch and set separate trims on pots etc. People are flying Helis with it, again so much is possible you can set almost any crazy requirement, once you understand the unlimited possibilities.
It’s a very clever bit of kit. I’m into my second year of flying on the same prototype Tx, lots of hours of faultless operation. I visited a new club last week and was demo flying a Foam 4s BearCat that is fitted with a 7s single aerial Rx...the Spectrum guys could not believe it when I was 500m+ out at head height around the back of some trees in knife-edge! It was a spec and still felt 100% solid.