The dialect of Malay spoken in Riau Province is considered by linguists to have one of the least complex grammars among the languages of the world, apart from creoles, possessing neither noun declensions, temporal distinctions, subject/object distinctions, nor singular/plural distinction.
Then Wikipedia says Creoles possibly develop from Pidgin, which is a language for getting two different languages to communicate with each other. I have never really had to communicate with someone (where we didn't share any of the same languages) for long enough to need to do more than hacked together hand gestures and grunts basically. But I can imagine like in a shipping/trading/agriculture scenario, you eventually might need to start getting more detailed than just grunts and points and start speaking. So then I imagine a Pidgin starts developing (don't know anything about them yet). There is some basic grammatical structures that just happen about and you can get your points across. Then when new children come to learn to speak, they get whatever is simplest first, which becomes standardized eventually into a "Creole". That's at least (it seems) one suggestion of how Creoles start.
But if that's the case, that a Creole is basically the simplest grammar a child needs to communicate (or at least is a simple grammar), I wonder why we don't all just speak Creole, and why there is instead these "more complex" grammars like the Indo-European languages or the other non-Creole languages of the world (I guess you could call them "more formal", but that doesn't seem right either). Not sure if there is a clear distinction between Creole and non-Creole.
So my question is why we don't speak Creole instead of these non-Creole languages (at a high level). If Creole is simpler it seems it would be better. I wonder if one could briefly outline what is lacking in Creole languages that are not lacking in non-Creole languages. That is, why there needs to be (or ends up being if that's the case) non-Creole languages. If this is a really complicated topic, knowing of a good resource or paper to look into would be helpful.
In this on common traits of Pidgins, they basically sound like isolating languages like English or Chinese, so it makes me wonder if Chinese could be comparable to a Creole (even though it doesn't seem to have arisen by merging two other languages), and same with English. It also makes me wonder why things like tense and conjugation evolve if they are more complicated rules to the language and don't start off in the Pidgin. So this applies to the reasons why non-Creoles develop, and what benefits or simplifications they have that the Creoles lack.
Also just thinking, maybe it's partly because, while Pidgins/Creoles may be much simpler than non, they aren't as efficient, so you end up not being able to express as much as quickly, or things like that. Just maybe a reason why non-Creole languages arise.