Let's face it... Deciding to retire is a big decision to make. When you retire, it can be very difficult to go back to work and somehow make the same amount of money that you did when you were working.
Besides, who wants to go back to work after retiring? Even if you decide to work part-time after retiring, you don't want to go back to the stress of the old job.
For Mike, he wanted to be confident in his decision to retire. He didn't have confidence in his own piecemeal approach nor the simple calculation that his previous advisor did.
Mike realized that personal finances are complicated and he couldn't afford to guess and gamble with his life savings. So what did he do instead?