Redactor hasn't been disabled, per se, we just no longer actively develop on it. So that said, if you want to use Redactor, it should still work.
@julian Yes, redactor is not broken per se, but we want to use the file upload button which was removed in an earlier version.
Please see this github issue which explains it: https://github.com/NodeBB-Community/nodebb-plugin-composer-redactor/issues/80
With nodebb version 1.15.0 we could work around this by commenting out line 177 and 180 from this file: https://github.com/NodeBB-Community/nodebb-plugin-composer-redactor/blob/ec318e4fc932aa97b8158f68a440417949eac5cf/static/lib/redactor.core.js#L177
This brought back the file upload button and it worked fine.
With nodebb version 1.16.2, we could bring back the file upload button again, however, it does not work anymore. You get the "choose file" dialog but when you select a file and confirm nothing happens. No errors in the web console or the nodebb output.log or the webserver logs.
If you could make the file upload button re-appear and work again in redactor, we would be fine sticking with it.