Revolving spool reels were around for a long time before "spinning" was invented. The guy who invented the spinning reel called it "threadline". Before WW2 it was acknowleged that spinning had a limitation in how heavy the line could be. But "conventional" reels required skill. while 15 minutes of instruction made you an "expert" at spinning.
Follow the line down the guides on a spinning rod. See that 90 degree bend in the line as it crosses the bail and goes to the spool? That's one disadvantage right there. Now imagine a cast. The line has friction going over the lip of the spool. and makes big, energy-wasting loops as it comes off. The first guide on a spinning rod isn't called the "gathering" guide for nothing. In contrast, when a conventional reel is cast, the spool wants to spin FASTER than the line peels off. It's a "push" or "negative resistance". The disadvantage to a revolving spool reel is that it requires skill. Squidder is a great reel, but doesn't have a mechanical nor a magnetic brake to assist casting. A "mag10" or a "mag525" requires less skill than a Squidder. An Abu 6500-c3 requires less skill than any of the above. I can't think of an easier revolving spool reel to cast, but that doesn't mean there isn't one, just that I can't think of one at the moment. Also...when baitfishing, the "clicker" "(ratchet"," line-out alarm") has less resistance for a fish to feel, assuming you spike your pole. I have learned that you miss a lot by not holding your pole, so perhaps that argument is less compelling than the others.
The best of casters still gets the occasional backlash. Picking a backlash out in the dark is difficult, if not impossible. I use spinning exclusively after dark, despite being quite comfortable with conventional reels. For 8nBait, for spiking your rod during the daytime, IMO conventional can't be beat! Distance isn't all that important, but if it is the parameter YOU measure a reel by, let me say that even a poor caster with conventional can out-distance all but the tournament caster using spinning. It's not even close.
Flounder
PS: For a boat, where casting isn't a factor at all, there is NO EXCUSE for using spinning gear!