This will continue to work for some time but can come back to disturb later.
Logon as guest and/or without password is being phased out. And SMBv1 is also. Samba often follows the default behaviour of official SMB.
Sooner or later we will have more recent versions around. And then it's upon extra configuration to enable these old methods again. Which I expect Samba to provide even when the options are long gone from MS implementations.
The reason for this is security of course. SMBv1 is a risk. And SMB access without password is a big risk. But if only read-only accounts can do so, no potential harm. And disregard the encryption and signing misses of SMBv1 - with media and for home networks these are nice to have, but no must.