In reply to Ciprian Popescu.

Well, first there is a big difference between WPCS and PSR – not just in style, but in content.
* PSR only checks for code style/formatting issues and even then is incomplete with no rules about array formatting and some other things.
* WPCS also checks for code style, but on top of that checks for lots of general coding best practices, can find common mistakes and scans the code for certain security issues.

So switching to PSR would – aside from a lot of disruption – actually leave devs in the WP Community worse off as they would be missing lots of important checks.

Secondly, your question includes an assumption: “as there are more maintainers there”. Unfortunately, that assumption is largely incorrect. While there may be more outside contributors to the automated tooling to check PSR, the majority of the work is done by one person – the same person who maintains WPCS… (as WPCS uses part of the PSR sniffs, so its part of the work done for WPCS).