According to the other comment, "skating is not about coach or team", which is obviously wrong. It is an important part of the whole sport and as that it was, is and will be discussed.
You shouldn't create the false reality in which people who ever used the abbreviation 3A or some other did it with disrespect towards skaters or didn't take them as individuals (in some amount many people did it whether they are fans or their counterparts of the skaters or their coaches). People can be fans of whatever or whoever they want to be. There is no law of nature saying "this sport is about this, but not about that." That does not exist, it is about what people want it to be about. And you can easily be a fan of a skater and fan of a team, for many reasons, style, type of the choreo, approach etc. That does not exclude respecting skaters as individualities and being fan of them.
To be honest I had the exact opposite impression, that those who are the exact opposite of the fans were taking the skaters "only as members of a particular team" (e.g. "only jumping beans", that was a popular and disrespectful term) for whatever reason and only when some skater leaves the team they are suddenly concerned about this or that skater's individuality.
As for the precise case of those three skaters, of course they are often talked together they train together, compete at the same competitions, they are seen together, they are compared against each other. And they represent completely new level of skating, different from everything that was here before. Even when it was used broadly, people still talked about the artistry of Kostornaia, jumps of Trusova or delicacy of Shcherbakova. So once again, just because people often used the abbreviation they shouldn't be scolded. After all, tghe recent comments about it are not raised by some specific comment, that could be erventually considered as disrespectful, this is just blanket ranting of the kind "those people are horrible".