I would love to see more settings with religions as well done as Eberron, and hopefully no more "Lolz pantheon sorta" stuff. Unfortunately the default assumption of the 5E multiverse seem to pour cold water all over than, and give a big high-five to the most eye-roll-inducing pantheons possible.
For sure, although I'm pretty forgiving about it. For one thing, the "Here, have some pantheons!" approach is at least as old as 1E AD&D's Deities & Demigods, and that was itself rooted in fantastical tales from pantheon-worshiping cultures (Norse, Greco-Roman, and Egyptian, just for starters). Second, all we've really seen for 5E settings is peeks of Forgotten Realms. FR is neck-deep in pantheons, but it makes sense in FR's terms: if gods are literally people that sometimes walk down your street, there's probably a lot of them, and there's probably very little variation between types of religions. Finally, a tidy pantheon can make religion a lot more straightforward in your game; I was a big fan of 4E's pantheon for exactly this reason.
I love Eberron, and I love its careful, nuanced approach to belief-systems, but I don't think a similar approach would be desirable in every game.
Some of the possible star pact patrons given as examples make Japanese Tentacle Porn Monster seem normal and friendly. One is the Chaos Hound, a giant dog made up of maggots whose purpose in life is to eat the souls of the faithful, he can't stand the taste of the unfaithless and false. Now imagine having a romantic relationship with that!
Wait, what other than normal and friendly
would you consider Japanese Tentacle Porn Monsters? I'd say they're the very model of friendliness, by at least some definitions.
Primarily because it is a restriction that 5e introduces that wasn't present in either 3e or 4e warlocks. I can't see introducing a new restriction as being somehow in harmony with a goal of inclusivity.
Even as far back as when the warlock was introduced in 3.5E, there was still the
implication that every warlock had a patron, even if there was mechanical enforcement of that. The same was true in 4E, with the exception of the vestige warlock (who killed 3.5E's binder class and took its stuff). We still have yet to see the 5E warlock in its entirety, so it's much too early to complain about what warlocks are forced to do.
It shouldn't be hard coded into either the crunch or the fluff for 5e, since it wasn't in either 3e or 4e, which makes up a good chunk of previous D&D players.
Clerics have gods. Warlocks have patrons. Depending on the table you're playing at, you may play a whole campaign without ever even having to specify who your god/patron is. At the moment I see no reason to expect 5E to deviate from this pattern. What's the problem?
I can, easily. Read the original warlock entry in 3e Complete Arcane.
Also, it's worth noting that Mike Mearls himself had a warlock character in the livestream that didn't fit the description I'm reading in the 5e version. He was fiend pact, but his "pact" was some sort of connection to a more abstract infernal iron law concept. The other warlock we saw in the livestreams was a fey pact warlock who was trying to find a way to break his connection to his patron (or something similar).
The word "patron" certainly implies personification, but I think that might be a misnomer for the concept it represents anyway. I don't see any reason why the examples you've given couldn't be perfectly legitimate.