For 2, its just default setting. Something has to be in programming. This is the default way so its default. Don't over complicate it :)
For 3, I've always chosen the slow road there. That's just how I've always done it. Should I wish to do more then I then also disable Indexing service and/or also go into Indexing Options and remove all folders possible. That is just how I do it. I don't question what doesn't cause me problems.
For 1, last but not least, I don't remember the specifics. You should be able to research them. But specifically the drive properties it actually says, "to have contents indexed in addition to file properties" and its for the entire drive with no exceptions if you go with the full thing. I've always done it for performance tweaking just because I never use Indexing. The tweak has been around for a long time. Do you need to do all 3? Probably not. But, it gets it out of the picture of possibility to a greater extent.