@davemccoy is saying

you will face stronger players than you currently do under this system. Under the old system, many low level account rose and diluted the competition...

But like you said, If we rose to D2 rank with the "help of bots" then those bots are also dillution. Meaning we will be condensed into bot ranks. The lower tiers will appear to new users and "cheap/poor" users that Splinterlands is FULL of bots. It will look like only bots play the game. Scaring off new player.