When I was in high school ( about 30 years ago ), I was into the early Polaroid Land Cameras, and was fortunate enough to still be able to buy the "roll-film" for the original large series folding cameras - the 95 and 850 series. I longed for the 110 series, which employed a Compur-type shutter and Wollensak lens, but they were too dear.
At that time, the only film I could get was their ASA 3000 B&W film, which developed in a mere 10 seconds, and then had to be coated with a special squeegee that smelled vaguely like horseradish. You got eight prints to a "roll". It was expensive then... I think a "roll" was something like $10 in 1980.
But, the idea of a camera that produced a positive image on the spot (originally in 60 seconds ),without a darkroom or chemicals, was certainly significant, if not influential. And by the 1970's, Polaroid was producing SLR instant-print cameras: the SX-70.
Ultimately, Polaroid's instant print system might have been a dead-end, but I think it was "influential" on how people took pictures. I certainly remember all the aunts & uncles having them in the 1970's, at family gatherings...
Changing horses, I think the Kine-Exakta deserves to stay on the list: again, even if the Exakta package quickly became outdated, it was the "first" system SLR 35mm camera...
Going back about six or seven years, I used an Exakta VX-II exclusively for almost two years, even though I had a perfectly good and functional Minolta XG-1 kit with motordrive and several lenses.
My biggest complaint about the Exakta is probably the slow lenses, due to small mount / body opening.
But, Ihagee blazed this trail some 15-20 years before other makers entered the SLR market.
Are there "better" ( "more refined" ) SLRs ? Certainly. But I don't think that lessens the "influence" of the Exakta.