Actually, my fescue has given way to brome the last few years. Jo, I do miss it in the winter, makes good feed, way better than brome.
My experience with thistles. They took over the area 10 years ago. Sprayed, sprayed some more, dug, mowed. Just as many as when I started. Dedicated my self to eradicate them. Failed.
Some older guys bought the bugs that were supposed to eat the flowers. They put out a lot of them. Would laugh, they got a box of thousands, and were susposed to put 4 on each flower. Started thinking I was winning the war, with my efforts, but it was the bugs. Thistles are no longer a problem. I won't spray or mow any that aren't in my yard, or other wise in the way. Maybe if a big patch is in the lot by the house. Gotta' leave some to keep the bugs alive.
Have some people around that kill them all, or nearly all, and they fight giant patches every year. Hard to let most of them go the first few years, but after you get a bug population established, you're more afraid a bad winter like this will kill them if they ain't fat enough to hibernate. gs