you don't need to do sketches by hand in order to create great logo. I used to do everything directly in computer cos I sucked at sketching too. As I'm getting older, I like hand-sketching more and more, but that's just a matter of what's your favorite way. Good logo or branding isn't about sketches, it's only something that may help you find what you search for. Similary, custom typography is just one thing that can make your brand more unique, and it's definetely one of the most laborous ones. Good identity is about combination of good concept and appropriate execution of this concept. It can be really simple and you can even use unaltered existing fonts only, and it may still be a great identity if you do it for good reasons and if it has relevance to what's the identity for. However, learning about type design (not that I have any proper education to speak about this), graphical shortcuts, geometry and so are all "ammunition" that may come handy one day, and will widen your abilities and understanding of the problem in general. For outstanding logos and branding, you probably need to be able to both think out of the box and to have graphic design skills that allows you to put your ideas into life.