As a quick rule of thumb, any question that begins "Am I the only one...?" can be answered "No".
I grew up with cartridge fountain pens (Parker Vector, mostly), so I have no animosity for them. In my Kaweco Sport I've moved from the rubbish converter to a Diamine cartridge and it's miles better.
Cartridges aren't my favourite ink storage mechanism, but they're not the end of the world. There's no need to be sniffy about them.
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