#3 is now irrelevant because people don't write with pens. They type on their phones or, when at work, on their laptops.
#5 is no longer true, as dictionaries are now on Pleco. Yes, I found it hard to look up words in a paper dictionary when I started learning. But, for today's learners, their first dictionary is Pleco on iOS/Android, and this pain is gone.
#7 is a weird one. You only need one romanization method (Pinyin) to learn Chinese, or to look up the standard (Mandarin) pronunciation of a new character. When would I ever need to use or read Wade-Giles, or any other romanization method, unless I'm reading the romanized version of a Taiwan/HK person's surname?