I definitely agree with you on this; they've always been fringe razors until now.I mean lately, there's currently a rush to get slants and stainless steel. Slants were not on most shavers radar for decades
I've had a Merkur and Lych slant from way before they were "hip", and now I have a vintage Fasan Doppelschrage (which I love).
I personally find that the 4 degree tilt of most slants does not contribute much to the shave. To me, they're not good slant razors - they're good razors that happen to be slanted.
Plus vintage slants just look cool.