...well...
First off, I believe you are incorrect. Nobody around here advocates hitting 400+ before using drivers. That makes no sense. Most people advocate hitting at least 350 with something like a teebird before going to something high speed like 9-13, yeah, and that's because you won't see much gain distance wise by discing up. You'll just get more unpredictable results.
Bottom line is it's about fun. You want to have fun, throw whatever you want.
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Throwing putters and mids isn't very fun but they are more inherently accurate and precise due to their narrow rim width, though stability is a huge factor as well. An errant throw with a nuke could go anywhere. Consistent throws with a nuke will almost certainly end up farther apart from each other than consistent throws with a wizard unless you are a top pro.
Also consider niche discs like drivers for rollers. Easier profile to get over on to the ground. Or easy to throw discs like blizzard, starlight, air, etc. Why not use them?
And why have drivers if the average hole is 400' or under? Because I don't throw rocs 400'. That's a rarity, a true big gun. However, there are a LOT of people out there that can hit 400' with a teebird and above, myself included. The majority cannot, but that doesn't mean it's uncommon or rare. But I'm not going to tell you not to have fun. Use what works. If you want to get better and work on technique, then think about discing down for a while. It isn't the discs you throw that make you better, it's understanding how to throw them and how they work. I feel drivers are a big part of that learning process, but you don't need a katana. At your distance, less stability will net you more d than just a wider rim. And that's pretty universal to a point. It's why people who can't throw as far like pro katanas in the first place. So try a pro leopard or a dx teebird or even a vision or sidewinder. You'll be surprised. Most people don't realize how far they can throw things is due to stability because they shrug off the lower speed base plastic as not as good, opting for high speed instead. Suddenly pro becomes appealing.
Nobody is trying to hold you back or hold you down or saying "you must be this tall to ride".
I think you are over generalizing. Go out, have fun and throw whatever the hell you want.
. We carry drivers because we want to. You can too.