I would to like to know how a plane with it's wing and elevator glued unparalleled will behave in air. what bad tendencies it's going to have and finally is those tendencies are more visible under low 3d almost stall speed type of flying on during faster f3a like flying

thanks

p.s

could someone please explain why all this happens aerodynamics speaking

Looking from the top.. plan view.. a misalignment between the wing and tail will have a slight effect for a small offset.
Looking from the front...Tilting the tail relative to a horizontal reference results in the plane turning towards the high side... That's how birds turn.
In a competition airplane, any physical factor that departs from optimum is bad. These can require trimming of the control surfaces which add drag, and an airplane that changes response with airspeed.

Anytime there is misalignment between the flying structures it will be noticeable during changes in speed. For example, looping, coming from a dive....etc. The plane will tend to roll to one side due to the asymmetrical lift component. Slow 3D the aircraft is under constant operator input so it doesnt affect the behavior as much.

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First off just how much out of alignment are we talking about here? If the stabilizer is tilted only 1/4 inch over a 10 inch half span then it's not an issue. If it's a 1/2 inch tilt or more then it most certainly will be an issue.

You can always trim a model that is out of alignment to fly at ONE speed and in level flight. But it's when you want to change that speed or do maneuvers tha the misalignment shows up in some way.