Steve you need to differentiate between the good stuff on Ancestry and the not so good stuff and the maybe stuff and the actual junk.
Ancestry has images of Censuses, birth and death certificates, plenty of other primary documentation. This is not junk it needs to stay.
Ancestry has indexes, which are not as good as documents, but have definite value, They should stay unless, you happen to have the primary document, that the index is referring to. For instance they have a Find a Grave index, but we can easily reference the original Find a Grave (which may be good or not)
Then there's the Data Collections, which I consider definitely iffy, and would only use if I were desperate. But they're not bad to use as clues, and definitely better than nothing, but I always try to figure out where the data came from in the first place.
Then there are Ancestry Trees. If the link is dead (which you can't tell without a subscription) then it's garbage, just taking up space. Occasionally the link might actually take you to a tree, that has sources attached, which saves a step. (I have a small tree on Ancestry. The main person has 20 attached legitimate sources, no indexes, primary docs). However, most of the trees on Ancestry are unsourced except by other trees. They are frequently inaccurate. They are without a doubt junk, but you can't tell without looking.