In addition to many of the reasons already listed:

I like the hands-on aspect of Histotechnology, combined with the 
science of the chemistry of the procedures interacting with the 
biochemistry of the patient's tissue and the disease, intermixed with
the art that is required to produce a high quality result.

There is some automation in the field, but we are still touching, feeling
seeing the tissue - during grossing, embedding, sectioning and staining.

We are mixing chemicals, using the pH meter, weighing out 
reagents, all to make a stain that will attach to a chemical
component in the patient's tissue.

But we are using our knowledge of the biochemistry of the
patient's tissue and the pathology of the disease process, to
modify the procedure when the disease so dictate