GreenTongue:
It is not like there is a shortage of systems available.
There should be at least one you can play as written.
If I may be so bold...
You're exactly right. There are hundreds of systems out there covering any range of topics. Some systems mess with different dice mechanics, different skillsets, different ways of handling combat or social interactions. Others are nearly-identical replicas except for one or two things (perhaps the setting and the classes, or the dice and the combat modifiers). There are games out there for simulating everything from world creation as gods, to call center jobs, to the voices in one man's head, and then all the way back again. Certainly, one might say, there is something for everyone.
That being said, many of those systems cost money. Money is not a resource I personally possess in quantities that would facilitate trying out system after system in order to find my perfect match (and I feel many are in the same boat as me here). Even if it were, the vast majority of systems are either obscure or difficult/impossible to find. So I could have all the money in the world (if I was a wealthy giiii-iiirl), and still not be able to find my perfect match. Both of those points bring up the issue of time, which is another resource few of us possess in the quantity needed to try out a few dozens systems to find out perfect match (and I think that's being generous with how many it might actually be). Then you have to contend with your tastes changing as you get more experience, or just at random. So you can spend years looking for your perfect system and find it only to discover that, a few months later, you want something else from it that it doesn't have (not saying it will, just that it can). And maybe you lucked out and your new perfect system is in your list of previous attempts, or maybe it's not and the search begins anew.
And every system, at least of the ones I've found and tried in my own years of roleplaying, falls into pitfalls just the same as anything else. They might not be the same pitfalls, but I've yet to find The One System
TM that I would simply play as-written, without any changes whatsoever (though, admittedly, I always try to do that first to see how things work out). Then you have to get into the logistics of how many people actually know about that system, and/or how many of them would find it perfect/be willing to play it without changes, and then meeting those people and forming a group... and I could go on but I think I've made my point by now.
In short: Sure, it's possible that there are systems out there for everyone. BUT, just given the number of new systems and revamps that come out year after year, not even all of the developers seem to be happy with the work they've done, and so we end up here. You work with what you've got and what you want and try to blend them together with the time, money, energy, and experience you have to make things the best they can be in the now. Maybe you'll get lucky and overcome the odds, or maybe you'll create your own entire system one day for others to enjoy and houserule into oblivion. What you choose to do is up to you, but (at least in RPGs) I feel like there's no wrong answer so long as everyone at the table has a good time (not to condone anything horrific or illegal, so just assume there are twelve-thousand asterisks here).
Sometimes, "perfect" just isn't obtainable and "close-enough with a few houserules" seems like the preferable option. Not saying everyone does it, but that's certainly my mentality.
P.S. I know that "perfect" was my term, not yours, I just thought it summed up the argument nicely. I'm not trying to imply you thought a system had to be perfect to play as-is, merely that (ideally) what we're all looking for is a perfect system for ourselves (even if you want a system that has flaws, that's "perfect for you").