I'm just typing in the departure airport and arrival airport and economy or business. No interest in flexibility really. Never really had a problem that justifies fully flex or whatever. If I have to sit around for a while after arriving early, then so be it. To me that is the better option than paying 4x the price to change flights due to a late meeting or whatever.
Just trying to keep things simple for my own sake

Got 3 different fare buckets for my next lot of flights in Feb (O, R and something else). Work for me and I roughly know what they are from the odd thread here.