First of all, those contractors are conflicted with rendering an objective assessment of your systems because selling those systems is what they do.
When parts get difficult to find because the system is old, the fan motors are the last to have that problem. Had one myself this past Friday. This condenser unit was so old that it was beyond dating...that's OLD. Counterman took one look at it, asked me what it came off of (medium temp condenser unit) and returned 60 seconds later with a universal replacement that matched perfectly.
Get a plumber to run you a plumbing drain, with gas trap, to a location close to the indoor section in the attic. Move the condensate pump to storage until it collects a thick layer of dust, then toss it. I won't consider them dang things. Too many callbacks, accidents.