I think you nailed it when you said it depends on each individual's situation.
I am one of those who was diagnosed at 9 and just turned 33 - I would like to live another 50 years with diabetes and have already lived for 23 years with it currently. The older I get the more scared I get that, at my current level of control, I'm not at all certain that I would live another 50 years - every adult that I've known who has had Type 1 since childhood has died by their mid-50s. So I am getting ready to pay out of pocket for a Dexcom. That is something you would never do because it might decrease your quality of life, but for me I think it will increase my qualtiy of life.
But our situations are totally different. I work full-time and my work is not only varaible from day to day (though less so than previous jobs) but also involves a fair bit of travel. My blood sugar has huge, unexplained (at least so far) swings. Why is it that last night I bolused for an orange and ended up completely crashing and having to eat a bunch of food to recover as if I'd done a double bolus, while today I ate lunch and shot up to 329 as if I hadn't bolused at all? There are periods where I literally have no idea what my blood sugar will do, which is stressful, especially when my blood sugar crashes low or shoots high with no provocation on my part. I worry sometimes that I sort of slip into a helpless mode with my diabetes, but I think part of that is because I don't have enough data. If my A1c were 6.3 and I wasn't having major highs and lows on a weekly basis (at least!), I'd be totally happy. As it is, my A1c has never been as low as yours in 23 years, and I'm hoping a CGM might change that.
I do have things I am willing or not willing to do. I will probably never eat less than 80-100 grams of carbs per day because I have food allergies that restrict my diet in addition to diabetes. Exercise is something that I think is really important (for everyone, not just people with diabetes) but that I sometimes struggle to do. I am willing to weigh all my food at home but when eating at potlucks or eating out (which isn't a problem since I don't eat at potlucks or out much at all due to food allergies). I don't think I will ever be one of those who aims to be in a non-diabetic range at all times - but this is partly because I don't know if that's even possible (for me). I am sure my techniques will change as I get older - maybe when I am 66 I will be tired of all the technology or will decide that I want to go on a truly low-carb diet or will be able to keep an ultra regimented schedule - but in the meantime I have to manage diabetes for another 33 years before I'll even get there.
I think if you are satisfied with your diabetes control and with how you are managing it, then that is what counts. If you are not satisfied with it, then you should do something to change it. Why get something like a CGM just because everyone else seems to be getting one, if you don't feel it would help (same with a pump)? Where it gets hard is when we all get online and compare ourselves to others and feel like we should be doing this or that or using this or that piece of technology or this or that technique. I am bad at this myself - I used to look at people calling readings of 140 high or complaining about an A1c of 6.6 or restircted their carbs to 30 a day and feel bad that I didn't have such standards. Recently I have been trying hard to not compare myself to others. But, in the end, I have to find a way to be healthy but to do so in a way that will work for me for the next 50 years or hopefully more!