While I agree that baking wood is not 100% effective every time, (and that autoclaving would be better as it would kill spores if it were done for long enough), wood is not a perfect insulator, and if you put a piece in an oven at 325 degrees and left it in long enough, the whole thing would rise to temperature, and it *would* work. It could take more than a day, or whatever, but it would definitely work. 325 degrees would kill basically everything we care about. Not every single microbe, but close enough. I therefore don't think it's quite accurate to say that baking cannot be used as a means of sterilization. Practical? Maybe not. But an autoclave wouldn't be a perfect guarantee either, unless it were done for long enough. The critical variable is time, because the crucial problem is insulation.
I've actually started worrying less and less about completely eliminating every possible thing that could come in to my vivaria. I typically leave new cages up for 6+ months before adding frogs, and the point is to have a bit of an ecosystem going anyway, so I've personally become less neurotic about it. I recognize that this leaves me vulnerable to certain pathogens (chytrid most worrisomely) and I am not totally blasé about it, but I don't have the time or resources to (for example) prevent consistently nemerteans from getting into my larger tanks.