Programming languages that use white space to delimit structure are annoying at best. I get annoyed at yaml too, but I'm ok once I have a few templates set up.
These things actually matter, come up often enough to actually be annoying, and are a bit difficult to explain and learn into people. You’re basically fine if you just string quote everything that you can, but nobody does that.
Except that you have to either indent with only tabs or indent with only spaces. Any time you mix tabs and spaces you are just asking for disaster.
If you indent with only tabs you can't align things except on tab boundaries. If you have a function that takes 10 parameters and want to do it on multiple lines, the alignment of the extra parameters is going to be ugly.
If you indent with only spaces, you can indent things so that all the parameters line up directly underneath the parenthesis, for example.
I agree we shouldn't mix tabs with spaces. But use tabs always. I could line up parameters together but may not be just under parentheris, and it looks good and readable for me