HTB shaper - correct speed distribution when working through NAT?

Question

linux

When configuring files for client machines working through NAT (forwarding + masquerading for local machines is enabled on the server with iptables rules), it is recommended to use the configuration with the tags "MARK=xxx", but I just indicated through RULE=Ip-address
The shaper works, but where wait for pitfalls? Why is marking better when using NAT?

Answer 1

Maybe I'm wrong, but maybe it's just more convenient and clearer?

Answer 2

This will work for outgoing traffic to the local area, but outgoing traffic to the ISP will not be included in the rule, because. source address translation has occurred.