There's no point to diving dry in a pool. Drysuits should be used when only when nessessary and are a liability in all other situations. Unless you intend to get certified and dive in cold water, there is little merit in doing a discover drysuit class..
I'm going to have to STRONGLY disagree here. Bold emphasis. Diving a drysuit in a pool provides a SAFE environment to learn and get comfortable with a drysuit BEFORE venturing into open water. There is a huge advantage to trying a drysuit first in a pool or somewhere shallow with good conditions (e.g., confined water). You get a feel for fit, weighting, venting a drysuit, practicing buoyancy, recovering from a feet first ascent. You are in benign conditions with other people around including instructors/dms/lifeguards.
In fact, a confined water dive orientation with a drysuit is pretty much recommended/required by most agencies if you have never used one before. The majority of the time..this takes place....in a pool.
I've taught brand new students in a drysuit during their open water courses with zero dives. Drysuits are NOT rocket science and anyone who thinks they are either has not used one before or has not played around enough with one to master very basic skills.
True, they take more time to master than a wetsuit. You are essentially managing another buoyancy device. They are not complicated pieces of equipment once you understand them. I have absolutely no idea why you think they are a liability. Sure there is added risk like with anything dive-related but a dive in confined water while practicing these skills can help you mitigate these risks and learn.
Lastly, what is your definition of cold water? There are people that use drysuits (myself included in any water colder than 75 degrees). Many people use drysuits in Mexico and Florida. Water temp can be 67f-mid 70s You can get hypothermia in 80 degree water, it just takes more time.