Totally get where you're coming from, but I have a different take. Calling a tool "for rookies" just because it's simple feels like gatekeeping to me. A tool that gets the job done fast and right is just a good tool, period. It's weird we act like struggling with a harder method makes you more skilled.

Wow, I always thought that was a gimmick! But hearing how it actually saved you real time on a tough job makes total sense. That's a clever fix for a real problem.

Remember my buddy who did tile work? His back is shot now.

Did you try adding a tiny bit of red to the cheeks?

Wait, the_susan, are you saying someone would actually store wallpaper paste in a damp basement? That's asking for trouble. I saw a batch go bad in a garage one summer, and it turned into a lumpy, sour-smelling mess that wouldn't stick to anything. You'd be fighting bubbles and loose edges from day one. Using old paste is like building your house on sand.