You're missing the point. If your requirements are seating together then you got that option, from as little as £2 per seat.
I repeat TWO POUNDS, cheaper than a cappuccino!
If you decide to not pre select your seats then you get what your given with all the CoG load balancing dynamics that will be a factor.
Let's put Ryanair in perspective compared to the others:
Ryanair 2017 plan