It's not about 'basic' versus 'extra stuff'
You are better when you play what you have practiced.
your attention is a limited resource.
when you play 'extra stuff' you have to pay extra attention to how you execute the new fingerings and choose notes
this attention has to be drawn from other areas like your timing and your ability to listen.
When playing 'basic' roots and octaves you don't need to pay so much attention to execution, because you have those fingerings down well
so your attention is freed up to listen, follow the groove, and play with some considered feeling.
no need to feel bad
just practice the 'extra stuff' until you need less attention to play it.
then you can re apply that attention to timing and listening.