For me, it comes down to wanting to try different razors with different characteristics, to see what is best for me... When I first switched to DE shaving, I figured I would continue to shave two or three times a week - the maximum I could get away with using the mach3, but now I'm settling into shaving almost every day. I think it's better for keeping my razor bumps/ingrown hairs at bay. So my needs are changing. My first razor, an Edwin Jagger DE89, excels at taking down several days of growth, but I'm finding it a bit too rough for daily shaving. As a result, I'm looking into some well-regarded "gentle" and "mild" vintage razors to meet the need.
I'm also just an enthusiast when it comes to vintage stuff... So there's that.
I would have never guessed that the DE89 would be too rough for daily shaving from what I read it is a very mild razor! Hopefully other will chime in on this!
I shave every other day but would like to change that to daily and I think my iKon Standard is too aggressive for that so I was thinking about the Super Speed and trying to find out if that is mild enough for a daily shave!