I will preface this by answering this question bluntly- I have enjoyed trying new gear. I like really short focal lengths, really long focal lengths, and everything in between. It is part of the hobby that brought me joy so far, albeit expensive over time so I am slowing down.
Also, I will note that having multiple refractors can also make sense, as they can be very different tools in a decent aperture spread, based on eyepieces and mounting solutions.
There is a propensity to want to collect refractors, just for being drawn to various functional equipment with some overlap in usage and liking all of them, and not wanting to sell them. No logic or critical analysis here, just pride of ownership and enjoying time under the stars with each refractor.
But let's dig deeper.
What does it mean to be content? This is particularly important for people without larger budgets and can only afford one refractor, and want an apo. Let's face it, they aren't cheap- if you told someone who isn't in the hobby pricing on various apos, even achros. You get a much better bang for your buck going the newtonian route.
Subjectivity comes into play. But for each person, I suspect it involves having a refractor that fits your observing habits with your equipment, which results in an optic that brings you joy and you use it lots.
Apo refractors typically excel in star aesthetics, wide field viewing, amazing for lunar and solar viewing, put up great planetary viewing for a select few planets (Jupiter, Saturn, Mars, Venus). Little fussing with the set up because of no collimation. Another large aspect of contentment involve having good build quality and mechanics, like the focuser or with some people, a sliding dew shield, ect.
I think Tyson raises some interesting points, particularly, what it means to be content.
For me, multiple scopes, multiple refractors are a given. It's important that they all fit nicely together. I'm not one who relishes trying out new gear, partly because it disturbs the relationships between my existing scopes, I prefer just to let things be and spend my time observing the night sky.
One thing about having multiple scopes is that there's a variety possible, if one gets bored with one scope from over use, there's others to provide variety. They're not new but they're a change of pace.
So what does contentment mean to me? I am not one who feels I must have the best equipment, the most perfect equipment, just good equipment that is, as Tyson says, fits my observing habits, my interests, my situation.
I'm not asking a 120 mm refractor to be the most perfect 120 mm refractor ever because no matter how perfect it is, there are other larger scopes in the lineup that will split closer doubles, show more planetary detail.. just a good solid scope with no obvious flaws..
I know myself. Some are afraid of or dislike collimation etc. That's not me. I spent 30 years in a research laboratory doing stuff that required hands on magic. I like to tinker with stuff. A Newtonian is perfect, if I can work my magic and make a split with a $240 used on Astromart 10 inch that was beyond the reach of a $15,000 apo triplet, that's ok by me.
I'm content with my equipment because I know I'm the weakest link in the chain. In terms of seeing more, it's on my shoulders. My equipment, in the hands of a better observer would show more. So being a better observer is my goal.
I'm content, my equipment provides amazing views, they're good enough for me.