And the previous presenter never disagreed with the judges???? He not only used to disagree but gave his own judgement on occasions, even about particular steps in a dance.
Tess has only ever used general terms such as "Well, we all loved it." "The audience loved it." or maybe "I disagree. That was lovely" She has never gone further than a remark intended to encourage the dancers.
One thing that should be noted is that EVERY judge gets to comment on EVERY dance. None of them is missed out because the host has made the job bigger than it should be. Tess has never hogged the screen; she does introductions and general chat. Her role is to keep everything light, the flow going and the show on time. She and Claudia do that brilliantly.
It's a much better now than it used to be.