1(a) I choose to waste 14 minutes of my time

Ok, it's your time.

1(b) inventory is too small

Inventory is fine.

1(c) I wAnNa TeLePoRt MeTaL (and speak for the whole community)

You speak only for yourself. Teleporting metal is not intended and will never be changed. Mod it if you don't like it, no-one is stopping you.

1(d) I suck at sneaking

100% a you problem, I can sneak just fine. Currently on a new run with modded skill progression much lower and higher death penalty, on day 6 hunting greydwarfs and trolls. And I suck at video games.

2(a) RNGesus

Some guaranteed trophy drops would be nice. I'm happy with the dungeons as is.

2(b) the merchant

I agree that he needs to at least be more easily findable - for newbs the one and only way to know he exists is stumbling on him. There are I think better suggestions and discussions on this already, however.

3, I too understand the desire for faster travel. Boating is particularly boring. I intend on my current run to take the shorter path to land and explore the island until I jump in the water again, rather than try again to navigate around an island in the way that turns out to be half the world long. Should be more interesting, though it's not faster.

4, they're not going to port metal. I like micro regions and biome weirdness. Bosses don't need to be at set distances. Can we decrease spawn rates for common and already rejected complaints?

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There's a lot that could be done to improve valheim, however dribbling out a bunch of stale complaints - some of which have been outright rejected already - helps no-one. There are some quality discussions on these forums, perhaps search and engage.