TWD Season 6

[Athene]

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It appears that the corpses featured are in varying states of decay, depending on when they they died and other external factors. That's why the recently turned seem to be more agile and are noticeably faster than the walkers in advanced stages of decomposition.

Some walkers flesh seem to disintegrate into soupy goop, when pressure or force is applied to it or other body parts, including their skulls. I remember a reference regarding that, though I can't remember if it was the show or book. Rick is explaining to Carl that a particular weapon would not work well if a walker had been recently turned.

The very first zombie Rick encounters in the first episode (the half lady) was basically dormant and almost completely rotted, kind of like the one that bit Hershel at the prison.

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I get that not all the walkers were created at the same time. But, it's still been (at least) a year, story time and  Most of the turned came in the first weeks, as shown in "Fear the Walking Dead" and implied in "The Walking Dead." But, there are walkers by the thousands everywhere they turn. The walker population should be dwindling as decomposition wipes them out, but there seems to be as many as there were in the first season, less the odd few killed by survivors.

Don't get me wrong, I enjoy the show, but the walkers resilience doesn't make sense.

You're right.  At some point it would have to mean that there are a lot more survivors than what's implied, in order to explain hordes of the walking dead traipsing through town with regularity. But would the show be nearly as good?