Keeping the heels and knees together. Using toes only for early music. Not playing legato in Baroque music.
Other people find the methods like that a burden - they're boring, uncomfortable, and slow to internalize. For them the results are all that matter. They will play with heels, if it feels better.
And there is the third group of people who like one method or the other and they obviously want to achieve results. But they also understand that without the process nothing would happen. Without sitting down to practice for a certain amount of time, it's difficult to learn anything worthwhile.
It doesn't have to be good practice. You just have to show up and do it. In the long run, you may just as well figure out a way how to practice efficiently. But at first you have to sit down and play. Day in and day out.
Results are more important than methods but a process is more important than results.