As for tech gear, I use my XT / IQ4150 and 32/50/70 HR lenses quite regularly (like every week). Earlier this year I set myself a project of visiting and photographing historic factories and other interesting industrial structures in the wider region where I live. I try to combine my other travels with visits to sites that I scout on the internet beforehand, down to knowing exactly where I will be shooting from and where I will park my car. The gear is coincidental: sometimes I just take an SL3 with the 21 APO and do the corrections in C1. Or shoot 4x5 film when I fancy it. Bottom line is that the XT is the most convenient and efficient tool for the project, in most situations. I also have two XF bodies and several BR lenses (all bought 2nd hand) - I used to use these heavily in my shoots with models in the past years (art nude/glamour fashion). I recently put my efforts in this genre on hold for a variety of reasons, but I am keeping the bodies and lenses for now (second hand prices being so low, why bother). In any case, I am more and more of the view that my gear should be justified either by my ongoing photo projects or by typical use scenarios (like holidays where I prefer to shoot film). Beyond that, there are cameras (mostly film) that I simply like to own, even though I may not use them often. I sometimes feel guilty about owning so many but so what...Jay Leno and Nick Mason presumably also don't drive all the Ferraris in their garage all the time.
An important observation: The gear being coincidental for me is based on the realisation that inspiration, location scouting and preparation are more important. Since I started my project, I bought or reviewed a number of books by Gabriele Basilico, Thomas Struth, Marc Power, the Bechers and others. I watched Youtube videos, including some very good ones by a gentleman who teaches architecture photography at a US university (exchanged comments and emails with him, obtained his pdf books). I have also studied with interest the works of painters (like De Chirico, Canaletto, etc.) whose technique, depiction of perspective, light etc. provide clues and inspirations for my project. All these influences gradually blend together to shape my vision for the images - the choice of gear is then determined by that vision. I like drama in the images, so I gravitate to very wide angle lenses for exaggerated perspective, high contrast presets or orange/red filters for film, long exposure times to get movement (frame averaging on the IQ) etc. To keep my overly long write-up shorter, the point is that every lens and every accessory is attached in my mind to some pictorial objective. It has to have a clear role to play within the context of my vision. Not the other way around (I am not the kind of person to "take one lens and see what I can do with it", definitely not as far as tech gear is concerned).