Maybe what I've failed in getting across is, with steaming, in good lighting...the water/light allows you to actually see anything left on the lp.
I've cleaned lps through my AD/16,5 time and again, still, there are just some times where steaming is THE only way to get an lp clean.
Ex: I was just listening to my Outlaws lps, I pulled the "Live" record out. I had marked previously.."re-steam?". Mind you, this was way before I had my 16.5/AD cleaners.
I was re-steaming under my under-cabinet led light and can see the little "flakes" on the lp that are stubborn, but will come off when you apply first, common sense, then a more aggressive application. These are the types of things that will not come off just through any automated process.
This is why I believe that being able to actually see what's going on while cleaning is essential ti The Best process.