To be fair, most "portable" video recording systems in the early 70's were skip frame.
I remember reading about the Cartrivision, and being willing to cut the limitations described some slack on the basis that it came out in 1972, which is *very* early on in terms of domestic videocassette recorders.
That was, until I'd remembered that the Philips N1500 also came out in 1972 and didn't have a lot of those limitations. It was the first model to support their flop "Video Cassette Recording (VCR)" format. In particular, it doesn't appear to have been skip frame. In fact, from what I've read, the N1500 appears to have been far closer in design and execution to later video formats like VHS and Betamax.
That's not to say it was perfect- apparently there were problems with the design of the reel-on-reel tape mechanism and feed, and later formats increased tape efficiency by removing the need for a guard band, amongst other improvements. Still, it looks to have been more advanced than Cartrivision.
Not only does the current article itself mention the N1500, but reading it more closely it actually makes basically the same points I made above about its technical superiority and closer resemblance to later machines!
In Cartrivision's defence, the OP's comment that it had "no rewind" is incorrect; the "no rewind" only applied to rental tapes used in domestic recorders; i.e. it was an anti-feature designed to ensure once-only viewing, but didn't apply to regular tapes.