I think this misses the beauty of a plaster wall. Level 5 drywall has nothing on a skilled artisan with plaster, and yeah you can’t hang things through it but it also lasts hundreds of years. My walls are 120 years old and robust, the kids haven’t damaged them and they’ve more than held up.
You can hang things through it just as easy as drywall too. Light stuff just put it right into the lathe. Heavy stuff, with both types of walls you are going to want to anchor into a stud.