They don't have obedience like Hissho do, so each part of the hive is not like the other and bishops might want to steer their drones away. Hive or no hive, your task is to control multiple colonies. If you want to expand endlessly build autonomous admininstrations.

They have an overcolonization penalty for the same reason every faction does: to limit how many colonies you can have. Sounds obvious, but it's the main limiting factor to an empire's size, and therefore, a pivotal aspect of the game. In Craver's case, it's particularly important, because makes it so you can't spread like wildfire, colonizing everything on sight and depleting them ASAP with no regard to the fact it will leave you with a weak system - you are getting new ones at the same time, after all.

In another words, colonization penalty is an important part of the game's design, and a limiter that would be particularly OP if removed from Cravers.
(many people oppose the Saints & Sinners law for that reason)

I agree that it's quite the micro-heavy strategy, but it seems so fitting to Cravers that I like it anyway. 

For the evacuation part : I usually try to secure a path between the newly colonize system and the consumed one before sending the civilian ships. Afterwars, I sell all the improvements, and then I burn all down.

What is also interesting with this strategy is that is forces you to chose short-terms solutions instead of long-term ones : you'll have to scrap everything eventually, so building expensive building isn't a good thing. You don't care about wonders, developping your systems (above the first level) or building improvement requiring a lot of strategic resources (those will mostly be used for your fleets, or be sold on the market when there is a price spike).

The most glaring issue with this strategy is that it is highly map reliant : the bigger the map, the higher the risk of meeting a players with highly advanced systems whose economy hasn't been distrupted by your non-stop agressions. You must be everywhere as soon as possible in order to not let other players outpace you.

Another thing to note : I don't know about you, but I usually play with scarce resources (strategic and luxury), so that there is a more interesting colonization game. Because of this, the rare systems with strategic resources must be preserved (if not, you'll lose a lot of options for your fleet equipement), and you need also to keep at least one system with the luxury resource you chose for your first system development plan. These systems can be further developped (ideally, there shouldn't be Craver population on them, so that they be used as "crisis fids stock" if you have problems in your "frontline world" => in that case just send a Craver pop in one of them, eat minor pops and grow your Craver population fast).

Finally, since your home system cannot be decolonized, you'll have to develop it, and fast, so that it doesn't become a burden latter on.

All very good points Hinin! The other thing about Cravers is I feel they are only good on paper and trailers, but in game they do not feel well made and not very immersive. One of the biggest fun factor playing Endless Space 2 is roleplaying the species I'm playing because the Endless universe is so immersive. Cravers need a lot of rework in game to make them feel more Craver-y and unique instead of some random empire that has citizens that depletes planets. The improvements and events are biased towards humanoid non-Craver species. Why was there an event asking me that my minority citizens want their names changed correctly? Do the Cravers even care when they view everyone as food? why do they even have xeno-tourism improvement? I read one funny reddit post commenting it "The violent and canabalistic natives of The Husk welcome you to spend your holidays on the barren wastes of a once-beautiful planetary resort. Explore the vast cavernous strip-mines that cover most of the planet. See the empty plains where verdant forests once stood! Visit the museum of all the animals we ate to extinction!"  lol