I would disagree.
Yes, talking about buyins is much better - but then it's up to you to determine how much you buy in for. At least on the lower half of the poker table spectrum. I would say that Before 0.50/1.00 tables that's OK behaviour.
After that people will expect you to have 100bb, som might even say that you're ratholing if you're not auto rebuying to the max at the higher levels.
How big your bankroll should be Before you move up is up to you. It depends on your skill and nobody here is a better judge of your skill than you.
Yes, most proffesional poker players feel that 100 buyins is about right for them. But you're building your bankroll, and the microtables are alot easier than the poker they play.
I would say that if you've gained over $100 at 0.01/0.02, then you probably have the skill to move up now. If you do 50 buyins at 0.01/0.02 and then grind your way to 50 buyins at 0.02/0.04, then that can be your bankroll - and then you grind away until you have enough buyins at 0.05/0.10 to give it a go - but if you lose that you go back to 0.02/0.04
So, to complicatenthings I would advice you to have a limit for when you go down in stakes as well as up. If you have a really bad run, then that will give you the time torecover - and also put some pressure on you to perform better.
To sum up:
1. decide what your buyin is
2. decide how many buyins you want in your bankroll to feel safe at all times. (How many buyins would it be near impossible for you to lose?)
3. decide how many buyins you would feel like you need to try out a higher stake table.
4. Decide when you need to move down in stakes, and actually accept and move down when you need to. There is no shame in this, and you don't need to rush it.
5. ...profit