I think this is unfair - the author was not insinuating that the people who designed this system at Github are stupid in some way, but just asking if other architectures have been considered.
To me, asking an engineering org if they’ve considered alternative architectures for their main engineering problem is silly at best, overconfident at worst.
> I would love to know if something like this has been considered and why the decided against it.
... but that still sounds more like a grammatical hedge than an actual suggestion that github didn't think it through.
imo it's fair to lay out why you're surprised about some decision in the hopes that someone will enlighten you, even if it can be tricky to phrase that without coming off like a "why didn't you just..." comment.
He didn’t even open with a question, rather he opened with a statement. I don’t think there is even a question mark in the post as it stands right now.
I hate tiptoeing around to avoid offence, but it would have been better to frame the post as a question, it would likely avoided people reading negative intent behind the post.
That’s the polite way of calling them stupids ;)