I like beer and drink a fair bit of it, and make it. I have had some alcohol free beers and have recognised that they were either bad or alcohol free on the first taste, even when I was blind to the lack of alcohol
Low alcohol can be made good. I have made a 2% stout which tasted good and a 3% hazy pale ale and both taste fine, but you can’t get to low enough alcohol to call it alcohol free through fermentation
Apparently you can get to alcohol free through reverse osmosis which doesn’t wreck hop flavours (which boiling or vacuum boiling will wreck). Perhaps I haven’t had any alcohol free beer made with reverse osmosis