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I took all my fish out and went fallow 2 times in 6 months. I pulled them all up had quarantine systems in different rooms. Treated the fish with copper and still had ich after both times. It was very difficult and completely worthless. I'm not saying that it is not possible to quarantine fish but I am saying that it is easy to get wrong even if you do everything right. I currently am trying a reduced stocking rate and UV but I 100% understand your problems. I have killed more fish in copper QT than i ever did just dropping them in the tank. I do see the merit in at least some QT though. My QT is observation only while allowing them to learn to eat. Fish illness is by far the most frustrating thing that i deal with in the hobby.
You're right, QT is not easy. If done correctly Ich and a host of other parasites can be permanently removed. If you feel uncomfortable with copper then you can try TTM or hyposalinity. Keep in mind those two only work for Ich and not other parasites.
For me it is a non-issue. In the early 2000's I didn't QT anything, relied on fish selection and observation. It worked for awhile, but eventually I introduced something nasty and it basically wiped out my fish. The issue with observation is you cannot see parasites attached to gills. Also parasites don't always have a physical manifestation.