Maybe it’s one of those things, but I’d never considered buying a “good” pen before, and now I have I appreciate how poor all the commodity pens are.
I switched to the TWSBI Eco extra fine. The line is tight and precise (good for subscripts with subscripts), the pen is easy to grip, the piston fill gives roughly 3 times the ink capacity as the Lamy converters, and the clear barrel allows you to see how much ink is left. The TWSBI is roughly the same price as the Safari.
I do much more writing since I started using fountain pens, and it's changed my work habits. I think better when writing than when typing (maybe) - but in any event, it's fun to write with good instruments. Reading physical books and writing with pen and paper are good ways for me to resist the urge to stare at a screen.
(I get my pens from JetPens. I noticed a while ago complaints on Amazon about some of the Lamys possibly being counterfeits - no way to confirm, don't know if it's still an issue.)
I grew up in the 90s in Germany, so every single child between 6 and 12 had these - before you became "too cool" for them and started using anything else to rebel against the system (tm).
So while I believe you that it's a good product, and I see that there is nothing obviously childlike about the design, I still can't separate it from that image in my mind.