I've unlocked all the ones I want and didn't find it fatal, I've also been having fun with them ever since. Other people who've unlocked some don't seem to think it's all so earth shatteringly terrible either.
Sounds like any video game. If you don't like it don't play it, it's only a big deal if that bothers you.
And that's the point, you are having fun with unlocked weapons, but the road to getting them is massive. It's a 500 mile drive through a highway without any diverging paths. Who would call that an amazing journey? It's even worse than an on rails MMO, where you move in a linear fashion, but at least the scenary/story/enemy is changing.
Also, I don't get FD, they want to attract more people (making tutorial comprehensable, progression is far easier than ever before, focusing on development where the most amount of people will enjoy aka combat and so on), but yet you say if you dont like it, dont play it? What if I don't like this aspect of repetitive unlocking and 80% of a playerbase agrees? What if only a small handful of CMDRs unlocked all guardian weapons? Is the game for a small handful of players who have no problem driving 500 miles in a straight line?
It's not subjective, it's a fact that it's a bad design decision for repetative gameplay which is only a gateway to the real meat of a game. Once you do it, you forget it forever.
And I understand that you already did those the hard way, your work will lose value once the blueprints become more easily achievable (and trust me, they will).