You're right - I'm in complete agreement with you that no one answer fits every situation.
If you happen to select one of the few coffee shops in America that serve outstanding coffee, you will be in good shape. However, it's extremely difficult for the novice to identify what outstanding coffee -is- and learn to differentiate between industry best practices and the many myths and sloppy procedures that are used by the "average" shop.
Having just spent a week training new recruits at a business back East, I found (again) that trainees with no experience were able to absorb new content faster than those with other coffee shop (chain or otherwise) experience.
People that have worked at Starbucks and other businesses have a tendency to fall back on what they know from their prior actions; for example, froth milk to exceedingly high temperatures or small but important techniques, such as flushing the group heads regularly or wiping portafilter baskets dry. The "fresh" mind tends to be much more willing to accept this information when trained properly the first time.
Additionally, as I point out in my blog entry, those systems and procedures that are designed for a 100 or 10,000 unit chain are not necessarily the ones that you want to implement in your small business. Learning to "cook like McDonald's" is probably not the best approach for a new high-end restaurant. Similarly, you do not want to take your book of operations from the local "greasy spoon," and yet, it's what so many new business owners do when attempting to gain experience in this manner.
If you are lucky enough to have one of the "greats" in your backyard, know who they are, and can convince them to hire you, then good for you. For most, it's just not practical to move themselves and their staff to another town just to gain experience - that experience must come to them.