I think they are a good thing to have when you write, because they catch all the small mistakes I make, and trust me I make a few of them. Mine is named James A→I, on the other hand, call him Yoda. The poor bugger is going to be run off his feet this year with me.
The truth is I have had really bad luck when it comes to beta readers. I can never find ones that seem to stick around. I don’t know whether it’s because their lives get busy, or my writing is just shite and they don’t want to tell me. I’m the first to admit I’m not the greatest with punctuation.
And coming back after a two-year break I have to relearn how to do everything all over again. I’m not gonna lie, it’s hard. It’s going to take me a bit to get back into the swing of things, and then to be easy swapping from one publisher to the other, as they both like things done differently.
I’m lucky with Yoda, as he isn’t afraid to call bullshit on something if I’ve stuffed it up big time, though usually, he explains to me the right way to do it. Sometimes an editor will leave me a one-word comment (like plot) how the hell am I supposed to know what that even means. To me, it’s just part of the story. I think all editors should have to explain their comments so I can understand what they’re talking about.
So my advice is if you are a writer than find yourself a decent beta reader or two and let them point out all the little holes in the story, and pick up on the spelling errors you may have. It will be well worth it in the end.