That seems... unbalanced. Are there plans to change this? Currently, it just seems to make it MUCH easier to colonize, at no penalty.
It is. Nope. Yes it does.
Though beware that one of the fastest ways to kill the program is to have a massive number of populations. The processing time involved can rapidly scale to 5-10 minutes per time increment.
Earth is a warmer, heavier planet than is average for the planetary-generation routines Aurora uses. The biggest boost you can give a species is a wider temp & gravity tolerance; it opens up massive amounts of real estate.
The problem arises because the 'acceptable gravity' calculation is a straight plus-or-minus X gravities, whereas it should be plus-or-minus some % of your starting gravity. The easiest fix is to reset your species base Gravity tolerance to .88 or so. That should leave your homeworld at 0.0 but cut down on the number of low G sites. Alternatively, change your gravity tolerance to plus-or-minus .18 G instead of .4 G.
(This is why I always pick a 1.0 to 2.0 G planet for my homeworld, terraforming as necessary for Oxy or Methane.)