Nothing has changed all utilities are staying with the new eagle system . Pets being brought back is primarily for open world content.
All group content will be better without using a pet . Since one can make multiple load outs people that want a pet for open world will do a pet load out and if they do group content they will do a now pet load out.
Getting the pet back for MM does not give the pet the utilities back if you choose it , those will all stay with the new system . Blizz has even said this but I guess facts don’t count if they don’t fit the agenda I see.
As for them not doing anything else for MM since returning pets I guess this is Blizz doing nothing