For me, this is specific to the machine, as I have a high end embroidery machine and with that things like thread cutter and needle threader are a must. - and the low bobbin sensor and that it will shut off if it thinks something is not right.
But with my LA, I'd hate not having my 24" throat and 12' frame. And I really like the digital tension readout. I'd love a low bobbin sensor, and if it would shut off if the thread breaks. It has no sensors like that so I need to really watch it if I'm using the robotics.
And then with my main machine, a straight stitcher, the only thing I've got on that one is the knee lift, and I really don't miss any of the other features. Only time I miss a thread cutter is when paper piecing, and I don't do that often enough for it to be a big issue.