Hello @satsis,
Thank you for taking the time to write the review.
The integration with Polylang and our plugin is not a simple plug-and-play as we have for Translatepress and WPML, but with some adjustments, it’s possible to make this work with our plugin, except for the sitemap generation which currently has incompatibilities.
For example, one thing that most people are not aware is that when you enable the WooCommerce permalink options in our plugin under WordPress Dashboard > Rank Math > General Settings > WooCommerce you need to update the translated permalinks in the Polylang settings.
People unaware of that might not understand why the WooCommerce categories are not returning the slug they would expect.
This is just an example of something that needs to be checked in detail when using Polylang with our plugin.
Also, we added the compatibility in their plugin but they have not merged it:
https://github.com/polylang/polylang/pull/373
Hope that helps.