One Touch sweeps demand a clean bowl or there will be build up of concreted ash and grease that creates an air leak when the sweeps can't contact the bowl, or in the case of a Performer's gas tube, the sweeps will hit that tube. And the sweeps get in the way of your interior scraping job. And the first gen rusted, became discontinued, launching 1000 online threads for what to do about it.
I have one machine with daisy wheels. I can never remember which way to turn them to open or close. Get it wrong, and even if you don't, and the little stops will bend, or break off, and then the wheel will spin 360 and you're forced to crawl underneath and look to see if it's open or closed and by how much. Now, move around the kettle and repeat for the other two. And you'll have to scoop out ash, dump the whole thing upside down, or scrounge for rare Happy Cooker internal ash pans, or a hack thereof.
Grease got down there? That wheel will soon stick open or shut, whichever position you don't want. And the build up will cause an air leak as the wheel gets pushed away from the bowl. And you'll turn the wheel, as your hand innocently and slightly pulls down on the tab while turning, not meaning to, which will also cause the wheel to no longer seal against the bowl. Because no one wants to press their hand up against the hot bowl when closing the vents. If you can remember which way that is. As you crawl under and around the kettle on all sides.
Ask me again which method is "better."