Double edged sword, as a viewer and as a guy who goes to tournaments I see both sides of the coin, but at the end of the day, testers have tech, have strategies, are just by the nature of the work more experienced, and a shade better than us on release day. I think it's in the communities best interest to try and always level up collectively, as quickly as possible. One of the fastest ways to do that is to have experiemced players show what they know as soon as they know, so we all can adopt and adapt.
If a tester wanted to sit out for personal reasons, totally reasonable, but I'd want to absorb that knowledge as quickly as possible. People play their best typically in tournament, we all want to be the best, so why not beat, or get beaten by the best.
Would hate to hypothetically be running around like chickens with our heads cut off for a month or two with tech that some people know, just isn't all that viable. It's kind of like playing God, testers are scientists, the Petri dish is our meta. If injustice is any example, by evo testers didn't matter. Cream always rises.
I get both arguments. I just think we as competitive players will get better faster playing against people in the know. Don't know how good I'd feel winning a tournament with the 800 lbs "could I have beaten him?" gorilla in the room. (That's not true, I'd feel great)