This is definitely the case for me. I'm still running a stock converter behind my stroker poly and I've received advice that a higher stall converter would be beneficial but the thought of working under the car, unbolting the transmission and swapping it over just doesn't appeal to me, especially when there's a chance I wouldn't be happy with the new converter (as in how the car drives, too much slip), and then have to do it all again.
Working on top of the engine no issue, recently replaced LCA bushings no problem either, but I haven't got a lift and just hate being fully under the car, even with jackstands, timber etc as supports.
I've read the modern converters drive like stock until you're on it, but I'd like to experience it myself before I pull the trigger.