The only people I know who actually call it ess queue ell are either too new to know the "sequel" pronunciation, or the type of person you generally smell before you see.
I say ess cue ell for the sake of uniformity because it's not Mysequel nor Postgresequel and the language changed from Sequel to the acronym SQL in the 70s so not really in the "too new" ballpark anymore.
I think those make sense as deviations. I've heard "my sequel" but you're absolutely right about postgresql.
The name is kinda irrelevant like hard vs soft g in gif. People know what you mean when you say either.
But in that same vein, the creator of the "graphics interchange format" says the pronunciation is soft g, but basically everyone says hard g... So "official" pronunciation is kinda irrelevant.
I don't judge anyone who uses whichever term they want, but I've just noticed the general trend in my smallish interaction bubble.
Here in Germany everyone I know pronounces the letters individually – as German letters that is, which means the Q is pronounced "coo" rather than "cue". I don't mind it, it's not quite as clunky as in English.
I'm neither, I refuse to pronounce acronyms if it doesn't make sense to do so.
Same thing with 'gooey' for GUI, except I hate that even more because that straight up elicits feelings of disgust, I don't want anything gooey anywhere near any electronics