Three skill points in order to have portal level 2 + imps level 1. While you
can use imps without portal level 2, you're then stuck babysitting the portal and have to make sure that your desired action for the imps is absolutely going to happen at that point within a reasonable time frame. Which, in the case of late-game roaming parties that get stuck on themselves occasionally, isn't always the case.
If you're not using imps then you basically never need to stick a point into portal tech.
Having level 2 lets you plop down a portal, roll out the imps, and then go do useful things like collect potion materials or prep infected meats to load up the imps with parasites (parasites are wild and work wonderfully with the sulphurata, and putting them on imps makes a ludicrously powerful cuisinart of flesh). Once you get portal independence you can actually set up roadblocks in order to disrupt village supplies (and earn you a ridiculous amount of human).
On the topic of goliaths: Is there a limit to how many you can have at once? You obviously can't summon that many at once due to the health cost, but if you just summon and then smear them in sunblock, can you accumulate several of them before launching an attack?
And yeah, there are some definite rough spots in regards to storytelling and skill gain. The current skill system based around named characters is actually a fairly new experiment apparently, so everything's still very much in the growing phase. The dev has stated on a few occasions that there are a lot of ideas he'd like to explore with the game, but due to his inexperience and limitations as a one-man devteam he doesn't want to promise anything huge.
As for you necromancers out there... Is there actually any point to the phylactery? I haven't messed around with it myself, but it seems a bit pointless considering the save system. I feel like it could use some tweaks, as it does seem like a cool concept of using the chest to harvest souls.
Ruinarch is another game where you have to kill villagers, but the premices are different, it’s more like an inverted Rimworld and you are Randy Evil...
I have a great appreciation for Ruinarch as well, I'd love to see a proper thread for it around here sometime.