>>2919809
Scraping as much as you can is implied.

I don't know why in the past couple years every diy housewife thinks they're a drywaller because they have a lawn sprayer. Just go get your sponge and it will be perfectly smooth!

You leave it, tear it down, or you tool it. Those are the options. Quick tear down is pretty viable since it's rock hard plaster. Fix the important stuff in your walls while you have them open.