So in Chemistry class I've been taught that hybridization is a way we can explain things such as how $\ce{CH4}$, for example, forms four, equally strong bonds.
However at the same time I'm told that the Nitrogen in $\ce{NH3}$ hybridizes and forms sp3 orbitals. When I draw the orbital diagram for $\ce{NH3}$ this is what I get:
and so looking at this, I see that $\ce{NH3}$ should be able to form 3 equal bonds in the 2p subshell which matches our observations.
So my question is— why do we then explain the bonding orbitals of nitrogen in $\ce{NH3}$ using hybridization? It seems that all of our observations of $\ce{NH3}$ can be explained without the idea of hybridization?