I should also say that the official stance from the stakeholders in R has never been “Use R or nothing” - which is wise. Largely because anything done in Python could be done in R, and versa vice. Really the differences between the two are pretty superficial, thats why I find the feud between them over social media hilarious. They both just wrap C/C++ and are entirely driven by the community made ecosystem. They both do OOP in their own way, with speckles of FP in the mix for convenience(almost entirely in the same places). R just focused on numerical computing a bit more to be more like Matlab really.
The big mistake in my eyes isn’t “R vs Python” it’s “Why aren’t we all using Julia yet?”. If both parties combined their ecosystem cleanly into Julia it would be a done deal. Julia learned from the mistakes of both of these languages and corrected them from day 1.