I agree with number 1 and 3, but 2 should be a little different. It is true that we should be investing most of our excess money but not having to save any of it will be hard specially during unexpected circumstances. There are instances that we will be needing money right off the bat and since all of our money are outside for investment it will be hard for us. Instead, I think it will be best to have both savings and investments.
If there are no big expenses, then there may not be much savings, and in extreme cases it will be possible to sell part of the investment. It may not be good, but bitcoin can rise and we will get more money, and this will only be if we need a lot of money, but often small savings will be enough to cope with current issues.