I think it makes a lot of sense and I'm going to be honest. There are definitely caveats to ANY decision you make. I will explain the best I can and it won't be as good as some can because I am most definitely NOT a "monitor" expert, but I have PLENTY of personal experience in this regard.
First thing. If you are going to ALWAYS play at one resolution, 1440p makes WAY more sense. It looks MILES better than 1080p but it is VASTLY less taxing on your hardware than 4k. So, you get way better expectation of performance than you do with any 4k display, because you BETTER have the best hardware you can get if you want to do that AND maintain high levels of performance especially if high FPS gaming is important to you BUT you don't want to turn down the eye candy. And let's be honest, what is the point of 4k if you have to turn down the eye candy? 4k gaming is marketing. Yes, looks great. No, it's not great, unless you have very deep pockets and don't mind paying for GREAT EVERYTHING. Not just great graphics card. Everything. Everything matters if you want even marginally good high FPS gaming at 4k. Anybody says otherwise is an idiot or a liar.
At 1080p, with even decent hardware these days, you will get great performance. But maybe the eye candy isn't AS good as you'd like it. Waaaaa. If high FPS is what you want, this is the way to go. 1080p still looks GREAT unless you are on a VERY big, meaning 32" or higher, display. It also has the benefit of not looking COMPLETELY like crap on a 4k display. Yes, pixels are going to seem much larger and you'll be able to LIKELY identify individual pixels if the display is large enough, but it won't look distorted or "borked".
1440p on the other hand, requires like HALF the level of hardware, and looks WAY better than 1080p, but, ONLY if you're at 1440p. Or windowed. Otherwise, it is not going to look "right" whether at 1080p or 4k. So it's LITERALLY a "make a decision on what looks fine to me" and go with that and MY recommendation would be, GO LOOK. Go to Bestbuy, or a local shop, or ANYWHERE that will let you do this, so that you can look at a specific monitor size, with a specific resolution, on some few specific games or videos, and then YOU decide what works for you.
This is, of course, only MY opinion. It is neither all encompassing nor completely expert oriented. It is simply MY opinion, based on what I've seen and what I feel is accurate after done MUCH research on it myself when I was in the same situation as you are right now. Take it with a grain of salt and also seek other opinions and then make your own decision based on what you can glean from all the opinions and evidence. Otherwise, you just have yourself to blame for assuming anybody other than you actually had a god view of anything. None of us do. Not even the ones that THINK they do.