you shouldn't buy any PI title on day 0
There's a massive disadvantage to that. When you do that, you lose the chance to impact the shape of the patch with your own comments, opinions, bug reports. You haven't seen the game yet, so you have nothing to add other than repeating what others wrote already. And that means it's the opinion of others that matters for PDS when making the patch. When you finally buy it, you'll be late to the party as far as impacting the shape of the game goes.
Since PDS actually pay attention to this forum, unlike other companies - I'd rather buy it early, play it a 100h, see what's broken the most and post a rant about it (with attached savegames

) so PDS can do something about the issues I consider the most important, rather then sit tight for a month or two (however long till the patches come out) and hope others figure it out for me.
it could be fixed by simply getting an open beta for those who pre-order
Been on a few open betas in my life. I can only imagine what a bunch of amateur, lazy, entitled and useless (and then MIA) betas those guys who bought themselves early access with $$$ would be.