why no 12 GBS of RAM? IDK

Because computing architecture is based around powers of 2, and having memory that follows that pattern is more efficient.

What I think you guys all mean with 8 GBs of RAM is the bare minimum for nowadays standard is if you use it for IT related topics or you like to hoard stuff in it (which ain’t bad, unused RAM is wasted RAM after all) or simply depend on heavy programs which ain’t the web browser,

I would disagree. Even casual usage these days is much more demanding than it once was. Try having Chrome, Spotify, and Discord open all at once. You're going to start pushing that 8 GB further than you'd imagine. Plus, look at the new apple silicon macbooks. They put 8 GB in as the baseline saying shit like "since we designed it to all work together, it's more efficient", and real world test have shown that to be complete nonsense.

4 GB is completely unacceptable for deskop/laptop usage and would be a miserable, if not nearly unusable experience.

16 GB right now is definitely the baseline any new machine should have. I have a MacBook Pro from 2015 that has 16 GB and it still feels reasonably comfortable to use.

I do agree with your central premise here that it's absurd that we need so much. But it's just what happens as hardware advances, software developers push the limits of what the hardware can handle. Either that, or they're just lazy and don't bother optimizing since they think the machine can handle it (looking at you Chrome devs, and anyone who uses Electron).