You can explore lower security level areas. You won’t get an error message trying to jump in lowsec or nullsec as an Alpha, so you still have access to this content.
It’s considered as a near endgame content (only surpassed by L5 missions), and was easily botted.
Passive ISK income, no good for people that aren’t paying big CCP.
Again, you won’t get an error message trying to jump through a wormhole. Not having access to cloaking devices sucks in wormhole, but last I checked ratting fits generally don’t have any fitted on them, so you can still bash some sleeper head.
This isn’t surprising, and good in fact. T2 production is also high end content, just encaque of the skills required to efficiently produce it. And you’d still have to gather nullsec ressources.
Alphas can both run Invasions and Abyssal Sites. It’s normal you don’t have access to the ships.
Alphas are, in my opinion, an unlimited trial period. It’s good they are limited until they support this awesome game. A well, even if you don’t play much, 15€ isn’t that much per month.