the files of a plugin still there after uninstall

Even after uninstall, all the files of a plugin can still be found under luup files. I know the resource of my Vera lite is very limited. Are those remaining files gonna be an issue after some time?

At some time yes … until then … down’t worry about it!
If you ALWAYS download files from APP store … then you can zap files in the

/etc/cmh-ludl Area … they should be downloaded from the APP Store if they are still needed.
The problem is that some plugins may have written files there that are not installed … that’s kind of a NO-NO …
If you delete these files it may break the plugin … and not be restored by Vera.

If you manually upload files to Vera … you are responsible for knowing when they can be deleted.