There’s no way to downvote things, but having this as the default is such a bad idea, “just because some people are less savvy than other so it should be the default”. No.
I wholeheardly agree with argentum that an option should exist that allows one to do “Enter → New Paragraph; Shift-Enter → New Line”. But that should be a parallel option to what already is default now. After all, path dependency exists, and to set a different set of commands as default after all this time is honestly, malicious and a collective middle finger to almost everyone who already uses Obsidian.
To set it as default “just because” all the other PKM apps are is just weird, as well. I have to double-enter to create a new paragraph here in this very forum; I have to double-enter if I use Reddit, or Discord, or WhatsApp. To claim that it should be default because “people are not used to it” is intellectually disingenuous.
I also don’t understand the weird dichotomy being a “writer” or “coder” that the OP seems to keep mentioning. It is an intellectually dishonest argument just meant to separate the “us” vs “them”, and adds nothing to comprehension. To be 100% clear, I don’t write code, except for CSS that I tried to learn about a week ago, and written two theses, so technically I’m a writer. And I don’t give a flying flute about what Markdown standards are or not. But what I do know is that changing the default settings now is just going to cause mayhem for everyone, and for that reason alone, I cannot support “Enter = New Paragraph as default” in good faith.