TBI can be “spot on” if the intake manifold is “spot on” dividing air flow to each cylinder equally.

Since most TBI has 2 injectors or more,
that tells you it is hard to divide to each cylinder runner equally.

Having sequential multi point fuel injection SMPI seems good,
but should not each fuel injector be of slightly different flow rate to “put the icing on the cake”
since it is nearly impossible to make all intake runners flow equally?

Modern SMPI with equal flow rate injectors are said to typically be 8% off from best to worst air to fuel ratio deviation result.