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VHS doesn't work like that. It's not digital. It doesn't rewrite on a read. Magnetic hard drives and tapes don't rewrite on a read either.
You need to copy them to renew and VHS is analog so every copy is worse.
the head of the vhs is using magnetic resonates to read the tape, that magnetic interaction is the same thing that tape has always used. it is the same
edit: the real problem with VHS is the moving tape and how fragile the process is. the tape head can stick to the tape or the tape sticks to the wheels or the vhs cassette rollers sticking
Reading does not refresh the data! The head passes over the magnetic domains and that induces a current in the wires in the head.
That process does not in any way refresh the magnetic domains.
Yes it is the same for digital tape but at least with digital tape you can read the data and re write it perfectly onto a new tape because of ECC. Simply reading a digital tape doesn't refresh the data either.
VHS is analog. The signal read will be slightly weaker than original. That signal will be written onto a new tape as weaker because it is analog. Nothing in the VHS recorder knows what the original was supposed to be.
yeah, I was mistaken about VHS reading tape data.
thanks for the kind rebuke.