I remain fixated with cruising guides that come on bound paper, have contact information for the places we want to visit and word of mouth.
I share your enthusiasm for printed guides. I have and use a bunch of them.
But the dream of AC is that in addition to locations, reviews, contact information and tons of little details about each, we'd also have access to reviews by real cruisers like us (and some not like us.) We'd have recent, first-hand information that no printed guide would have room for, even if it were updated daily.
The form factor is also important. Guide books are great reading, and many have quick reference tables of locations, which come in handy underway. But AC data is independent of the form factor. It can be sorted, filtered and displayed in ways we haven't even thought of yet, all in real time on our hand-held and fixed-mount devices while underway.
Another huge advantage to crowd-sourced data is that it's not beholden to any financial interests. Some guides only list marinas, not anchorages. Some only print marinas that pay tribute to the publisher, or belong to the chamber of commerce for the coverage area, or whatever. Even then, not all marinas can take the time to send updated information to all the guide publishers.
There are lots of different companies who list crowd-sourced reviews of restaurants and hotels, for example.
But marinas and anchorages aren't restaurants or hotels. The customer base is much smaller. There are far fewer reviews, even on AC (the most popular US boating database) than you'll see for even the most out-of-the way hotel or B&B on Google or Trip Adviser.
I suspect that the marketplace just isn't big enough for very many different crowd-sourced cruising databases. If there isn't a clear winner, that all the manufacturers can get behind, then the data will be diluted and go stale to the point of uselessness.