Assuming the worst and quality of life drops post-50. If I live my life like I'm going to die at 50, I learn to appreciate life a lot more during my more youthful times. You can never get your youth back.
I think this depends on what you're going to do during that gap year. Do you really have something meaningful to do during that year besides getting a headstart on your professional life. I regret starting out heading towards pharmacy then realizing how unprofitable and mindnumbingly boring the profession can be (I blame my youthful, impressionable self), then having to do a quick turnaround to apply to dentistry. Do I think it was a waste of time? Definitely, since that put me behind in terms of retirement. Maybe that extra year made me into a better person, if I were to rationalize it that way, but that year cost me a lot in terms of time and money.
Parents pushing their kids to graduate sooner is a different ballpark. Most of the time, those kids are deficient in demonstrating initiative because helicopter mom and dad was always there to push them. Entering the workforce, being an 8-5 employee earning 100k/year sounds appealing for most people, but even with that income, you're still a slave for 30+ years. I can sortof sympathize the frustration that this generation has, when they have been raised in an "everybody's a winner, here's a participation trophy" environment. You may not be able to predict the future and life may go on without you, but that doesn't mean that people should accept their fate. Anyway, point of this tangent is something I've always emphasized... you need money to live. If you made enough money that you don't have to worry about money anymore, then you are truly free to pursue whatever you want, without restriction. You are no longer a slave to wages and money. Now if SHTF, you should have probably invested in guns, ammo, water filtration, survival gear, off-grid electricity generation, etc...I got a midlife crisis SUV a few days ago, and that's the beauty of having financial freedom. You can do whatever the hell you want without really batting an eye or worrying that you're draining your savings.