Erm, Seleuceia... the post you linked to only implies that they might bump up the number of permitted weapons, not their strenght.
"I've asked to bump it to 4 total per player and to make it moddable. Will look at buffing them once we tie it down more." ~Yarlen
Edit: counting minor planetary bodies (moons, asteroids, etc... ) sol system has more than 100 planetary bodies.
The Galaxy Scenario Definition file indicates that for "weighted random" and "random", 12/27 or 5/10 (respectively) of all "planets" are either terrans, desserts, ice/volanic, or gas giant...this would imply that for our solar system which you claim to have 100 "planets", somewhere around 45-50 of those would be comparable to the 8 actual planets we have....
Essentially, any given SoaSE random map has about 6x more actual planets than our own system...and since star color is random, you cannot argue that certain stars would have larger accretion disks (and therefore more planets, etc.)...
Additionally, a solar system in SoaSE can have many asteroid belts (4/27) compared to our 1 (1/100+)...adding in the Oort cloud isn't going to get you even close to that fraction...I'd also point out that systems in SoaSE can completely contain plasma storms and magnetic clouds, objects one might argue are likely to be larger than a single solar system or only existent in young systems (that would therefore not have developed planetoids)...
Sure, our solar system may not be representative of all solar systems out there...but I think it is safe to say that at the very least, most SoaSE systems would be considered outliers when compared to the typical solar system...
No doubt Sins of a Solar Empire is about solar systems, not galaxies...but when you zoom out of a solar system, you see a spiral galaxy graphic replace it (also, many maps use a spiral galaxy as their scenario graphic), which was really the only point I was trying to make when I said the systems look more like galaxies...