There’s so much planning and work you have to do for most vacations these days, that you need to take a vacation from the vacation. Between all the stuff you have to get done at work before you leave, and all the stuff you come back to, plus all the planning you have to do for the actual vacation, you come back more tired after your “days off.”
I think the only true vacation is if you just accidentally fall into a coma for like a week. Because then you didn’t waste any extra time preparing for your absence at work, you didn’t have to plan a trip, and people are sympathetic afterwards, so you have plenty of time to catch up once you awaken. Maybe that’s where I’ll go next year: comatose.