It is pretty much general consensus that doing fecals and de-worming accordingly is a much better approach. The parasites can become immune to the products used over time. (kind of like illnesses we get that just get stronger than the antibiotics we take)
I've switched to fecals for several years now and it's surprising just how much less it is really needed than using the old rotational method. I do still de-worm broodmares & babies on a schedule but the rest of the gang is as needed.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.