Mindfulness [Taqwa] is all about The middle-way and Balance - according to Bhuddhism

 (stress!) <-- positivity, curiosity, enthusiasm   -->  mindfulness [taqwa]. <-- stillness , focus, disassociation --> (laziness!) 

To maintain a state of mindfulness [taqwa],

one must balance the mind. 

Either extremes

take you away from Mindfulness [taqwa]

like most things in islam,

the answer is balance & moderation

the middle-path

If your mind becomes too still, focused and disassociated, 

it can lead to laziness

and requires a dose of positivity, curiosity and enthusiasm.

But

If your mind becomes too optimistic, inquisitive and over enthusiastic

it can lead to stress

and requires a dose of stillness, focus and disassociation