To be honest, I expect that in 10 years people will regularly use these sorts of text generation tools in the way text prediction and thesauruses and grammar checkers and spellcheckers are used today but for bigger blocks of text.
I can't really see why not anyway, as more things are in the browser it makes sense to me to integrate the ability to "AI check" your text like a grammar or spell checker to improve your writing along some dimensions that you like.
It's not honest, but in kind of the same way that a spellchecker isn't honest and since it's going to be possible anyway I don't see what extra harm it causes to make it accessible for everyone so that we can both actually see an upside and also begin to recognize that text we read is at this point likely to be at least partially AI generated and potentially factually incorrect.
Even better if things like Firefox reader mode, one of my favorite tools, can also do text summarization. Just imagine the adversarial interaction between a tool designed to generate confident sounding fluff and one to summarize confident sounding fluff. Honestly it seems like a likely inevitable future path.
It may as well be part of the browser where it stands a better chance of keeping people's long term attention on the ease of using these tools. Spammers will be able to do it, fake journalists and such will be able to do it, better if we can do it too so that at least we are aware of the potential abuse.