I guess that it makes sense if you get cold.
I dove dry suit exclusively in PNW and a couple of dives in San Diego. I got cold after awhile in PNW waters, but the water in San Diego was too warm for my shell dry suit (just sweat cloths under). In PNW I wore long underwear & woolly bear undergarment and still got cold.
Here I would absolutely EXPIRE before I got in the water, and sweat once I was in the water in a dry suit. I guess if I were in the water 90 minutes a dive, I may get a bit chilled, but I'm pretty sure a wet suit would suffice.
So, yes, you need to use the correct exposure for the conditions. And the same conditions affect people differently.
So you probably noticed that there is quite a bit more drag in a shell suit vs a wet suit, huh? At least I did. But I still dive as if I have one on, turning to the side to "vent" out the sleeve. It's a habit I don't think I'll ever break.