BlissLauncher is and remains an intensive problem, regardless of which version is installed. The only solution is to use a different Android launcher.
MAC adress: 00-a0-c6-eb-5c-d8 problem is handleable if - as will be the rule - only one Galaxy Tab S3 system is used in a network.
What is really important with a tablet system with 4G LTE is that at least the mobile Internet access via SIM card works, because - not every tablet with a SIM card slot can also be used to make phone calls. For example, Appel iPad or German Telekom has disabled phone calls on its T-Tablet 5G. Even with stock Android 13, no dialer phone app is pre-installed.