I collected vintage machines for years. At one point I had four featherweights, plus quite a few machines in cabinets. I finally realized that all I was doing with the cabinet machines was dusting them off regularly. I put an ad in the local paper and ended up selling all of the cabinet machines and three of the four FWs (most to a newly-bitten collector). I kept one FW, mostly for nostalgia value.
I realized that my "go to" machine was always my Bernina 1230. I preferred using it to all of the vintage machines, including the FW. At this point in my life, if I need a lightweight machine to take to classes, I will purchase one of the new lightweight machines (perhaps a Janome Gem) *after* trying it out and making sure I actually like sewing on it.
At my age I have accumulated wwwaaaayyyy too many things that I don't *love* and never use. I have decided it's better to keep only those things that really, really, really give me pleasure. All the other stuff is old luggage -- never actually pulled out and used.