When we do not have any specialized tools to predict the markets, why not we go for using the past to predict the future. Something is better than nothing.
Just because something is better than nothing according to you doesn't mean it will actually help people. It's impossible to time the market, regardless of how far back you look into Bitcoin's last performance.
There is only one 'fool proof' way of entering the market, and that's by dollar cost averaging your entry points. By the time the market is going up for a longer period of time, your sub $7000 entry points will pay off your efforts.
It's what I have been doing for years and it always works. Yes, some times you have to wait longer to book profits, but why is that a problem? The market makes up for all that once it rockets up.