So is SMB2 (or SMB3) dodgy, also?
I only enabled SMB2 recently, thinking it might help, but that was before I learned about KODI only using SMB1.
Prior to trying to set up the KODI box, my home network of 3 towers and several laps worked perfectly well without SMB enablement.
I know this for sure because there were no entries in the Lanman Server Parameters section of the Registry at that time.