Windows 10 WVD pnplockdownfiles bloat

Yes, the GPO printer map will re-install/verify the driver files each time a user try to login to a RDS server depending of the the GPO map settings, because it need to keep the settings in the user context. With a few printer and a few users it should not be an issue. But In the past I have seen large RDS envirenoment that were trying to load more than 200 printers on a 2008 R2 server and it did endup bloating the registery and it is very hard to cleanup. In these cases I would strongly suggest you to find another printing maping solution (Sometimes you need to tell the user that their printer/printdriver were not deisgned for multisession and they need to change the printer) or a third party printing solution for your environment.