My objective is not to save while retired, my LBYM lifestyle results in not needing to spend what I take in each month and so I redirect it to savings. Since I paid off my mortgage 2 years ago I have virtually no cash (unexpected need to replace my car last fall took out a lot of savings, paid cash of course) so I do want to build up a reserve.
If I need money for expenses I can tap tax deferred or a Roth but I prefer to not touch them. My reason is to leave as much as possible for my sister because she will need it, I don't. She could live on very little too but she will not have a pension, does not have a 401k, has 2 low paying jobs but because she also was taught the LBYM lifestyle she manages though not as comfortably as I do and she'll never be able to retire.
I've been a frugal person all my life and a LBYM person so this is not easy to change nor do I wish to change. I like saving money. If I need to buy something I will but I don't buy gadgets just because they are new and shiny. Our parents grew up in the depression and they were poor so we learned to use it up, wear it out, make it do. I grow a lot of the food I eat though there are times I'd like to take a break from the work. I could afford to but I like gardening and I grow some things I couldn't buy. I heat my house with a woodstove and save a ton of money on oil (the average person spends more on oil or gas in one month than I spend for the entire winter season) not that I can't afford oil I just like heating with wood and I'm a lot warmer. Along with the LBYM is a self sufficiency mentality that drives me.
I don't see myself spending much of my nest egg though at times it is nice to fantasize about squandering money on something like an expensive car, maybe one day. I never owned a nice car, always bought used cars, only purchased 2 new cars (and that was in the early 70's) so that's an option. I don't care to travel but maybe one day, who knows, I view the world as a dangerous place so I do my traveling to far away places via TV. I'm a homebody and seldom go anywhere. I like the isolation, I'm divorced no children. I live out in the country so there's nothing to do here anyway but there are cities not far away, they don't interest me.
Very few people would enjoy my lifestyle but I do. People wear me out, I prefer to be alone and that doesn't cost much. This all comes naturally to me, I don't struggle to save money. No surprise this is how I was able to FIRE.