Yes, it's true that I don't currently have a dynamic amp to drive my dynamic headphones - which is just a few actually, 2 of which are for computer usage, and only 1 for dedicated music listening (and my 1 pair of custom IEMs).
To expand onto my previous post, I've observed that Head-Fiers are naturally inclined to build up a gear collection - that's exactly what I did for years. You have to have a headphone for every type of music, or so you think, or so is reported by tons of other Head-Fiers. It's sort of like a chorus that's repeated by everyone.
But as someone who's taken that journey (since 2006) of collecting gear and only recently taking a hard look at what I really wanted to keep long-term for the sake of practicality, I think it's certainly possible for Head-Fiers to maintain a single system - maybe 2 or 3 headphones at most. When I asked myself what I really wanted my music to sound like, and which headphones I could live with, and which ones I didn't really need, the answer was obvious: I only really needed 2 headphones - 1 dynamic and 1 electrostatic, the Audio-Technica AD2K and Stax OII MKI. This was a frustrating outcome, because it's not very practical for me to have a simultaneous dynamic & electrostatic system (I often rotate between them).
The one thing I've learned the most from my journey is that one should get & keep the headphones that bring the most musical satisfaction. Not sonic satisfaction. I no longer listen to "sound" to dissect the treble from the bass or whatever other nonsense. I originally got into listening to music (note: not headphones) because I loved music - both the playing of it and listening to it. I'm not sure about anyone else, but I love music, and when I listen to it on headphones, I want to enjoy it, whether it's electronica, metal, bluegrass, or classical. And I found that my OII MKI/BHSE and AD2K could cover literally everything together, no other headphones needed. Bam, I'm done.
I think the idea of a "collection" is flawed. Does anyone really need a "collection" of gear? Do what makes sense. Headphone gear is expensive and takes up space. It's possible to simplify down to gear that will bring complete musical satisfaction. I've done it and I have to say that I have no regrets parting with any of the gear that I've sold. There are still times when I think I could live with just my IEMs and MP3 player. Well, until I re-listen to my OII/BHSE, and then that thought goes out the window. The OII crushes everything. Until I need some attitude of course, which is where the AD2K comes in.