Neil,
I would only agree with you up to a point. Yes, the Forums are a rich source of information for specific queries but there is still a lot of useful information to be found in the various books on boat modellintg depending on your particular interests that never goes out of date such as the books by John Bowen or Brian King for example.
Although glues and adhesives have changes beyond recognition, basic scratchbuilding techniques have not. You still have plank on frame just as it used to be and many of the tips for things such as deck planking spacing are timeless.
Books do provide a useful overview provided that you make allowances for updating things like paints and adhesives. Fortunately you no longer need to melt down a horse to stick the thing together although you may still be eating it between building sessions in a bun!
Likewise a lot of techniques remain the same such as installing running gear, while radio control has only really changed since the late 70s in the sense that you no longer have to worry about frequency control with 2.4Ghz equipment. You still have a box with twin sticks on it to control the model just as you always did and servo lingages are just the same.
For a beginner, the books by John Cundell:
**LINK**
and those by Tom Gorman (Google for list) are still good reading and give a grounding in the subject which can then be supplemented by specific queries on Forums such as this one. When you have a basic grasp of the subject it is much easier to ask questions which will get the answers you want.
Colin