I always enjoy reading David’s walkthroughs for my games and I don’t think they spoil everything. (Maybe he thinks they spoil everything! Hee hee hee!) I think they do a good job giving a complete account of the critical path and letting the mysterious stuff remain mysterious.
For the record, I have nothing to hold against David except maybe his bringing up Orchid Species of the Erastian just now, which I was kind of hoping everyone would quietly forget about.