I am and am not at once.
My Singer #3 is an antique, let's forget just vintage. It is so old, Singer has asked for photos of the machine and several sewing machine dealers/repair people have come by to look at it. No, it is not rare. There's quite a few, and the Singer #7 is the more modern version...but they were worked to pieces. On this machine I have had a part machined...so it's even beyond generic. And the cup to hold the parafin? it's an old coffee grinder cup that fit. Right era, wrong type of part.
Generally, I can find parts. Helen Howes is always a good source (and in the UK) among many so I can usually find genuine parts for the more common machines I have. Even making a back clamping 66 treadle to a more common side clamp doesn't need new, replacement parts.
But then again, my featherweight needed a new bobbin winder and I bought a new aftermarket and not original because original was almost as much as I paid for the machine and the aftermarket was $20. And if I can find a Union Special 43200g in a price I can afford to spend, most of the parts would have to be machined since there are almost no original ones on the market at all.
This is just repair. Actual use is whatever works. I have original attachments that I use: I have many different ages and styles of button hole attachments, zig zag attachments, blind hemmers, feet...you name it. Some are from the late 1800s and some are snap on feet with a new modern adapter and everything in between. My home machine was made in 1927 and has a permanent gadget that changes stitch length and makes it go in reverse added during WWII and most of the feet I use for it is from an 1888 puzzle box.
My oldest machine in use is from 1893, I bought a brand new one in 2017. The other machines I use regularly are from every decade in between.
TL;DR: I can be a purist when it suits and is easy to find, but generally I would rather have working machines that do what I want then worry about the age of the items.
Other then the Union Special, I'd like an industrial cover stitch, an industrial button hole machine and a real industrial dressmakers treadle (95, 96 or 31). If I could find the last, I'd get rid of my Consew I work on now.