Few things are more important than using your mind-muscle connection to progression your time under tension. This is especially the case if you want to build muscle and strength. In fact, your mind-muscle connection and time under tension are responsible for most of your muscle and strength progress.
Simply put, improving your MMC and TUT will get you results regardless of the details of your workout program. However, you will always struggle to get the results you want if your MMC is lacking and your TUT is limping along.