I had a conversation with my OS after my revision. When I mentioned I don't go to any physical therapist for knee recovery, and asked him if he knew why, he kind of quietly said, "Because they make things worse". When I asked him why, since he believes that, he still prescribes PT for his patients, he said it's hard to tell if a patient will move around enough on their own, or will just lie around instead. I then asked why doesn't he just prescribe a kind of PT where they assist with walking only? I forget his exact answer, but I think it has a lot to do with PTs and their beliefs, which I also think are outdated and can be harmful to knee patients.
IMHO, a lot of what doctors believe and prescribe for knee recovery is also outdated and my guess is things are beginning to change there also. Doctors prescribe the PT, but many therapists have their own protocols and follow them strictly. I think the whole relationship between doctors, PTs and knee patients needs a drastic overhaul, and hopefully it is happening, albeit slooooowly. But in the end, it's up to the patients to draw the line in the sand and make the decisions about what they will and will not do for their recoveries. If a patient wishes to do PT and thinks it's working for them, great. If a patient thinks PT is more harmful than helpful so decides not to do any formal PT, great. And anything in between is also great, as long as it's what an informed patient decides. That's the key here-patients need detailed and truthful information and the doctors and staff need to either fully inform patients, or recommend classes where patients are told the truth about knee recovery, or send them to this website, or all of the above.
It really bothers me when patients are still told untruths such as they only have six weeks to get all their ROM, and after that their knee will be forever stuck where it is at that point in time so they'd better work their tails off to get it by then or it's too late! In the case of this surgery, no pain IS gain. Hurting an already painful knee that has just been drilled, sawed, sliced and diced, is in no way helpful; rather allowing it to heal while gradually increasing your ADLs makes total sense to me.
As for your question about scar tissue, doctors and PTs misuse that too much and it's past time to put it to rest. If your knee is trying to heal from the assault that is a TKR, and you keep re-injuring it by doing heavy duty PT, how does that help? Ice, rest and gentle, gradual ADLs are all it needs to recover in the early weeks and months. At some point in the future you can begin to add more activities, but let the knee recover from the trauma first.