How do you guys balance language learning with learning other things?

In this community it's frown upon to learn multiple languages at a time (for good reasons). You'll confuse yourself with vocab and it's really challenging and time consuming (life time commitment just to learn 1 language for most people). Even polyglots will tell you not to do this

I feel like it's really challenging to learn a language and learn literally anything else at the same time. Like learning a language and learning to code at the same time? Super challenging. Being a student going to school while learning a language on the side? Super challenging. Feels like the time you spend on language learning could've been used on those other things or vice versa. Makes you just procrastinate and end up not doing either.

They say that most people have about an hour of Anki a day before they see crazy diminishing returns. Reason being is that spamming vocab like that is so cognitively demanding, super taxing on the nervous system. After a session like that you have nothing left in the tank. How can you then learn anything else?