What stings (as I can't help but empathize with the author's feelings) in reading this blog is that it sounds like they were very aligned five years ago, but she discovered a gradual growing miscontent only once they tried the early-retiree life.
Not sure if there's a possible fix there, other than trying to compromise (only one of them working, which would probably just lead to more growing apart)
I absolutely will never subscribe to the BS notion of "couples love each other more when they don't spend much time together".
I'm with my wife for 7 years now and I already worked remotely by the time we met. Our relationship is actually getting better with time.
So what you say mostly applies to people who are, let's call them, good roommates, not two people loving each other.
But it could possibly be offensive to some people that I call their couples "good roommates" which is a fair reaction -- I still have the right to my opinion however.
Sadly these things can and do happen. But we the people usually make it much worse by holding on to relationships that are past their date, for much longer than it's healthy.