A common problem adults experience when learning to handstand is a lack of shoulder flexion. They lack the strength and/or flexibility to open the shoulder angle to 180 degrees of shoulder flexion.

This affects the alignment of the handstand.

The workaround is to arch the spine.

This allows us to align our wrists, elbows and shoulders and balance our hands, resulting in a banana handstand.

A banana handstand isn't wrong, but it will limit your handstand progress.