What exactly are you saving for? If you die at 89 year old tomorrow with $10 million in the bank, what good was that $10 million to you?
This is a straw-man. You presuppose conditions that are not only of your own devising, but are highly unlikely and exceedingly rare. Most don't even live to 89, and most that do aren't sitting on that kind of a pile of cash, or if they are it's because they're still earning through their investments and are living the way that they want to, they're not denying themselves.
Most people that make a point of planning their long-term finances do so with an eye toward maintaining a comfortable standard of living throughout their lives, including during retirement. They do not want to lose quality of life when they no longer have an income. This means hitting peak savings at retirement age, where the money plus any further interest or growth will last for the remaining years in roughly the same amount as when one was working.
Saving for the future does not mean having to live like a pauper unless one has a job that pays incredibly poorly, but it does mean having discipline to avoid squandering one's money frivolously.