You show a fundamental lack of understanding of what specific means. The rules has to specifically override some other rule for specific to beat general to kick in. There is no such specificity in anything that you've shown.
Look, I will make it extremely simple, the order of combat tells you specifically: "Roll initiative. Everyone involved in the combat encounter rolls initiative."
Are you applying this rule or not ? If you are not rolling, then you are not applying the rule, and are not following the RAW. It's as simple as that, because that extremely specific rule for THAT ability check (it's only that one dexterity check to determine initiative, not any other sort of ability check) is not countermanded by anything in the rules and certainly general ruls about ability checks applying to ALL ability checks,
All you have quoted are the GENERAL initiative rules, none of which specifically say that they ignore the ability check rules or prevent the DM from declaring auto success of failure.
So you are calling the initiative rule "general" ? It's a single ability check for a very specific circumstance and you think it's more general for ability checks than every other rule about ability checks ?
Honestly, this is pure BS.
You are assuming that the ability check rules don't apply, because of a general and non-specific mention of rolling in the initiative section. Nothing there says you always roll
Roll initiative. Everyone involved in the combat encounter rolls
initiative
Can you please read that sentence for me, and point out the cases where you don't roll ? It specifically says
everyone.
, or that it ignores other ability check rules. It just generally says that you roll for initiative, which is true. Specific vs. general does not apply. And to get there, you have to ignore the language in several skills that also say you roll for the ability skill checks.
No, actually, as you've pointed out, they don't say to roll, and this is where you are trapped, they just say to "make an ability check"...
And the skills section specifically mentions rolling for ability checks more than that, yet you ignore that to try and be right here. All while ignoring that none of those skills OR initiative ever say that they ignore the other rules. You are ASSUMING something that is incorrect.
The rule about the elf does NOT say that it ignores the other rule, so you are totally wrong about that requirement as well.