In actuality, I am saying that.
Just like I would say " If you don't want to shoot anything, don't buy a gun or If you don't want to buy gas, don't buy a gas powered car." Not everybody who wants to have fish as pets is best prepared to do so. Just because you can does not mean that you should. When I was a youngster, I wanted a cheetah as a pet. I just LOVE that cat!!!!!!!! and I had the opportunity to get one. But I lived in a small house with a small yard in a small community and so after much discussion and disappointment, I didn't get it. But I did have monkeys because I could better care for them properly than I could the cheetah. See the point? Just because you want something does not mean you should have it.
Now I'm not saying that all people have to do it my way or no way at all. I understand that not everybody has the means. But I will say that if you are starting out today, especially with TODAY'S limitations, a QT tank should be part of the original setup and budgeted for. If it isn't, there is a greater risk of future failure than not. Just like if you don't change the oil in the car, the car will still work today but down the road, the bill to fix the car will be much higher than the oil change.
That's all I'm sayin'
In response to your comment that that tank was the "Gold Standard" for QT, I would have to disagree or say that it might be that way in your country but not everywhere. Whether fresh or salt, ( and that was a salt tank) it was not set up properly for medicating or fish acclimation however, as a first stage QT, all that tank needed was a reduction in lighting especially because many meds are effected by light.
As for my being the only one doing it that way or know how to do it that way, I leaned it from others so I am not the only one.
I also don't have many disease issues in display tanks. How many threads on the "sick fish" forum are devoted to that same issue?
I will also add that my comments are based on both fact and opinion. You can take them for what they are worth.