Scientist exp gain is by far the most useless thing out of that lot. You invest huge amount of time and resources to get the effect of a civic/trait. Sure its a bit stronger but so late game by that time you could potentially have immortal leaders all lvl 5. And even the ones you hire lvl 3 or so.
Weakest? Certainly.
"Useless"? Very questionable. It takes a long time to get your Scientist to lvl 5, specially if there are no more unexplored places to go. +20%/40%/60% XP bonus would help to replace that lvl 5 guy who just died, specially if your species is Fleeting.
Autoscanning stuff sounds good BUT by the time you actually have a science nexus up and running at full power you basically surveyed/traded for star charts the whole map. And even if you manage to discover new stuff in your sensor range (maybe coz you have the global radar) its probably too far away to reap the benefits.
I think we got a misunderstanding here. When I said "Special Project that requires a Science Ship", I wasn´t thinking only about Planet Surveys, but also SCANNING: Like Debris, Special Projects, etc.
In a decent-size war, you can have dozens of wrecks waiting to be scanned, and getting all of them, while keeping your Science Ships Helping Research at your planets, would be a powerful bonus, IMO. (Specially, if combined with the Sensor Megastructure)
That leaves the only real option that actually has something to do with science and thats "a" for more research speed. It is always welcome. You can never have more than you can spend because eventually you run into repeatable tech that scale infinitely. With such strong bonus it should be kept empire unique and it would be a great strategic focus for the enemy to take it from you. And i think that is exactly the kind of depth the game needs.
Agreed.
Same goes for dyson sphere. (which is not actually a dyson sphere but whatever) With that pathetic 400 energy that it gives its more like "i already won so im gonna build one of these overly expensive and totally useless things around a star coz it looks cool...
But if it gave energy proportional to the investment it takes to build one it could be the very foundation of your empire. With the energy it gives you could respecialize all your planets to mineral and science focus and still have enough energy for your fleet upkeep.
There would be a risk involved with it but surely a risk worth taking.
IMHO, having a project that completely eliminates your need for a specific kind of resource would be a bad desgin decision. *I* would, instead, let you build more than one Megastructure at a time, assuming you have the resources for it.
Luckily the sensor array is already where it has to be with regards to its role and cost. As of now in vanilla stellaris it is by far the most useful megastructure one can build. The advantage to know the fleet power, composition, current location and movement of all fleets in the galaxy is unparalleled. Thats exactly why we need the other megastructures to be a viable choice instead of a money sink.
Boring but practical.