I think I'm in a relatively good position to give you an informed answer because I have sold a 7x42 FL not once, not twice...
but three times (yes, you read that right). And every single one of those times I've been in a position pretty much like yours, asking myself many of the questions you are asking yourself.
1. I bought my first 7x42 FL and I was blown away by its view. I thought it was probably the best binocular I'd ever had, possibly giving me my favourite binocular experience... but I ended up not using it that much, because I mostly used 8x32 at that time. In fact, I see little use in 42 mm binoculars for the kind of birding I do and the kind of person I am (YMMV, but I tend to focus on the portability of 32 mm or less, or else the sheer aperture of 50 mm or more).
2. But then I missed the 7x42 FL sorely, its memory kept lingering. In fact, just like you asked, I had investigated alternatives and I ended up with a lovely Leica Ultravid 7x42 HD, which is an amazing binocular in its own right. But I missed my FL, so when the chance came I bought it (mind you, I'm not rich and, just like you, I don't like unused
expensive stuff lying around). So I found myself y 7x42 paradise with the Ultravid and the FL. I compared them and while I found the Ultravid to probably be a more "all-round balanced" model (there are several things about the FL which I don't find ideal)... I kept the FL for its intoxicating view. But, again, I didn't use it a lot... so after the same questions I sold it for a second time.
3. And the itch started again... and I found it for a 3rd time, and bought it. And the poor thing ended up getting dust in a cupboard, because I'm an 8x32 person. So that time I made some serious exercise about, ahem, "mindful ownership", and came to the conclusion that given my background with the 7x42 FL (mind you I've had a total of 7 different FL in 32, 42 and 56 mm, let's say I like the model) it was simply not meant for me, despite having given me my favourite all time binocular view of the +100 models I've owned.
Do I miss it? Well, yes, obviously, it is a great binocular. I'd be stupid if I didn't. But then, I'm simply aware that, even if I had it, I wouldn't have a lot of use for it, especially since my most used binoculars for the past 3 years have been a 12x36 IS Canon that for me are the ideal complement for a 8x32.
So I'm in peace with the 7x42 FL. I somehow feel the same way when you are with someone you love or have an amazing attraction, but the thing simply doesn't work in spite of the chemistry and the butterflies. Did you love that person? Yes. Do you miss it? I guess so, from time to time. But I'm in peace with that decision.
I personally try not to have duplicated formats, say only one 12x IS, only one nice 8x32 (as an example, I've recently sold my beloved 8x32 Swarovski ELSV in order to keep only the obviously worse Opticron Traveller, which I ended up using more, simply because 8x32 has become a "trekking" format for me, where weight an size are crucial, and the Opticron delivers in that area like few others). If I was very wealthy there are no doubt several objects I'd like to posses, and the 7x42 FL would be one of them, just like the 8x30 Habicht or the Mazda MX5. But since I am not, I'm happy with what I have and the use I give to this objects. We have a very small compact Ford MPV... but every Summer we put around 10.000 km of trips around Europe with it. Would I love a Mercedes Benz Marco Polo or a VW California? Hell, yes!! Can I justify ownership? Not at the moment. And so I'm happy
I hope this helps.