analog newbie question/vinyl weight

The good old days had vinyl with heft. Then the 1970's happened and all sorts of bad things started happening to vinyl, and it got very thin, and lightweight. The real problems had little to do with the thiness of the pressings... but the idea that it DID, stuck in folks minds.
The current "Audiophile" pressings of 180 or 200 grams is a marketing gimmick.
The actual problem with thick pressings is that they tend to arrive warped. (It seems harder to press thick vinyl and have it wind up perfectly flat., but actually all new vinyl has a propensity to arrive warped, at least more than back in the heyday of vinyl???)
As for sound, the grooves and whats in them is all. The thickness means nothing.
Thaough I do prefer a heavier LP myself... So I buy used LPs from the 1950's and 1960's....
But things like the first Dylan in the Sundazed pressing IS better than the original

One is heavier. :D

Now, without being a dork--

One really is heavier. The LP is also thicker, making it less prone to warping. That's a good thing.

In theory, heavier/thicker vinyl is a better playback medium than lighter/thinner vinyl because a heavy/thick record will vibrate less during playback and will deal with heat created during playback more efficiently.

In reality, there are too many variables involved, so that none of the theory really matters. Some of the best-sounding LPs in my collection are thin, flimsy, floppy discs. I have one or two thick "audiophile" LPs that are awful.

Most of the thick "audiophile" records sound good, but it's less to do with the thickness of the vinyl than to the care put into the mastering and manufacturing.