It depends on what you want in your tank. Objectively, yes, they *can* be a nuisance. Yes, they are certainly sensitive creatures and you should be confident in your tank's chemistry before adding.
If you view it as a nuisance in that mindset then I'd suggest not getting one -- because it will move -- and you will see that as a nuisance vs. the cost associated with having an anemone. You will need to be OK with the potential for damage to inhabitants but after really perusing the anemone threads myself and watching lots of YT videos, it seems like that aspect is a bit overstated.
I added my first anemone a few weeks ago to my 4.5 month old tank and have been successful so far. Although it has, like most people experience, moved to a less desirable area of the tank.
My research indicates that if they're stinging or killing your fish, then you may have other problems going on as most fish will actively avoid things that sting them!
IMO my personal worry points of an anemone are:
Tank not being ready, anemone dying
Anemone abruptly dying and causing a tank issue
Anemone moving and stinging corals
Anemone getting caught in a powerhead
Anemone eating sick fish
First two can be resolved with a stable tank. You can wrap your powerheads (though this is a pain). You can make sure your fish are happy and healthy with good husbandry.
Really the only situation where you don't have much power is the moving aspect. Anemones move especially if they're unhappy so forcing it to stay in a spot (idk how you would even do that) is not an option. It's up to you if that's a risk you want to take, but I would operate on the assumption that the anemone will move and not the hope that it won't.