Is it true that
we can apply toque = moment of inertia Xangular acceleration only
when moment of inertia about the axis which we are considering
should remain constant

Is this the same that when we use the variable mass system then we we generally use the formula dp/dt = Force ...

when the mass is constantt it becomes F=ma similarly can we say that L=Iw is more fundamental than torque =I x aplha which can be obtained when moment of inertia is constant