I couldn't disagree more. If possible, always interview with companies you really want to work at later in the process (its often not possible, but this should be plan A.)
Interviewing has a cost to the employer as well. If you are doing it just to practice with zero intention of actually working there, that is dishonest and disingenuous.
I'd argue it's hard to know whether you want to work at a company unless you interview. The cost of interviewing is miniscule compared to the cost of hiring.
I agree, always be courteous and professional, but you have to interview when given the opportunity. The wooing and interview goes both ways.
