Both emails are equally bad from a communication purist viewpoint, it's just that one has the traditional markers of effort and the other does not.
I personally have wondered if I should start systematically favoring bad grammar/punctuation/spelling both in the posts I treat as high quality, and in my own writing. But it's really hard to unlearn habits from childhood.
I see it now as the person respecting their own time.
I mean, maybe you should? Like... everything has a spell checker now. The browser I'm typing this comment in, in a textarea input with ZERO features (not a complaint HN, just an observation, simple is good) has a functioning spellcheck that has already flagged for me like 6 errors, most of which I have gone back to correct minus where it's saying textarea isn't a word. Like... grammar is trickier, sure, that's not as widely feature-complete but spelling/typos!? Come on. Come the fuck on. If you can't give enough of a shit to express yourself with proper spelling, why should I give a shit about reading what you apparently cannot be bothered to put the most minor, trivial amount of effort into?
I don't even associate it with intelligence that much, I associate it far more with just... the barest whiff of giving a fuck. And if you don't give a fuck about what you're writing, why should I give a fuck about reading it?
Of course, if you do have automated systems setup to correct everything, then by any means, use them.
I feel like founders embrace this, slack messages misspelled etc. but communication that is straight to the point
Luckily you don't see it very often these days, but I first thought it would be one of those old anti-virus scams. Seems QA is less a focus at Microsoft right now.
Correct grammar and spelling might be reassuring as a matter of professionalism: the business must be serious about its work if it goes to the effort of proofreading, surely? That is, it's a heuristic for legitimacy in the same way as expensive advertisements are, even if completely independent from the actual quality of the product. However, I'm not sure that 100% correct grammar is necessary from a transactional point of view; 90% correct is probably good enough for the vast majority of commerce.
You'll need to email someone so you'll fire up Outlook with its new Clippy AI and tell it the recipient and write 2 or 3 bullet points of what you want it to include. Your AI will write the email, including the greeting and all the pleasantries ("hope this email finds you well", etc) with a wordy 3 or 4 paragraphs of text, including a healthy amount of business-speak.
Your recipient will then have an email land in their inbox and probably have their AI read the email and automatically summarise those 3 or 4 paragraphs of text into 3 or 4 bullet points that the recipient then sees in their inbox.
On that front, at least, I welcome AI to be integrated in businesses. Business communication is fucking abysmal most of the time. It genuinely shocks me how poorly so many people who's job is communication do at communicating, the thing they're supposed to have as their trade.