Is it possible to add support to vanilla (or that doesn't support RER) servers? The client should have all the needed data it needs to display the information correctly (chunk and block data). A counterargument to that could be that RER should only display data from chunks that were generated and not those that were modified by players, a problem with that (that has been pointed out in many other issues) is that if you are using it for the first time on a world that did not have RER before, it will require you to generate more chunks. My suggestion is to make this configurable and possibly disable the generated-only requirement if the server does not contain the required code (this could be achieved by asking for the server's RER version and checking if the server responded (with the correct version) to that request or not).
Is it possible to add support to vanilla (or that doesn't support RER) servers? The client should have all the needed data it needs to display the information correctly (chunk and block data). A counterargument to that could be that RER should only display data from chunks that were generated and not those that were modified by players, a problem with that (that has been pointed out in many other issues) is that if you are using it for the first time on a world that did not have RER before, it will require you to generate more chunks. My suggestion is to make this configurable and possibly disable the generated-only requirement if the server does not contain the required code (this could be achieved by asking for the server's RER version and checking if the server responded (with the correct version) to that request or not).