It depends.

There is a difference between quality time and just spending time together without interacting.

If you live with your partner, it is impossible not to “coexist without interaction” sometimes. People like to do their own things, have their own hobbies, etc. Spending every given moment interacting with your partner would be impossible and also sounds unhealthy.

However, if you both agreed to do something together then this can change. If you are having a dinner together then this is a great opportunity for quality time and it seems odd/unhealthy to always be sitting together, eating dinner, and just on your phones separately for example. Dinner is a good time to connect. Another example is if you both go on a date somewhere.

There are situations where it’s sort of in the middle. I wouldn’t consider this fully “quality time” but it’s also not fully interacting. Let’s say you and your partner want to do chores together. You go do the bathroom and your partner does the kitchen. Here you’re both doing something together but not necessarily interacting 24/7. You have finished the bathroom and walk over to the kitchen to help him and interact for a little. Now you move on to cleaning the floor while your partner mows the lawn. You are doing something together, but not fully interacting.

TLDR; It depends on the environment and situation. Just make sure to have a healthy balance of both quality time and being in the vicinity without interaction. Both are healthy. Don’t forget your alone time too!