Has ping / tracert been blocked on 5g network?

It is doubtful you will find someone invested in that. Really serious users will use a VPN solution and avoid the port forwarding issues. Being able to use trace routing or the ping utility to troubleshoot is helpful but I guess T-Mobile is not after the serious technical users. It will just result in more calls to customer support which probably will provide little traction on the problems most of the time. If it garners a lot of negative press that might have an influence but the bulk of the users probably don’t have a clue what ping or trace route is. As long as the solution is up and running properly it is not often I go there.