I have found with feeds that don't give the full content, I might as well unlist most of them. Following the link, especially if I'm reading on my phone but even if I am reading on my computer, is almost never worth it to me and I just don't bother. I loathe feeds that give only partial data and prefer full, uncut text - I will happily scroll past it but I do not want to have to open a new page.

A feed that had humongous articles would either (if I were largely interested) be fine by me, or (if I weren't) be off my list. But a feed that had humongous articles that gave only a teaser and had an off-site link would be off my list unless the data was so critical to me that I couldn't bear to take it off my list. The bar for that is very very high for things other than journals maintained by personal friends.