Unpopular opinion alert! I dare to say that the only thing that is really evolved, is the terrain editor. Of course, voxel engines and voxel based sculpting is not that new in the design industry, but never before was it done in such a elegant and accessible way for regular gamers. All game editors and simulators still rely on the polygonal push/ pull and those fall flat when the angle becomes too steep, let alone that they allow concave shapes and the interesting formations we see in PlanCo.
And that's it. All the other systems are just minor variations on things that other games already do for decades. "Evolved" staff management just means some arbitrary timers for training. "Evolved" marketing is just the ability to let campaigns run concurrently and auto-renew. "Evolved" research means concurrent progress bars instead of only one. The so-called next-gen building system is basically just a a traditional 3D gizmo and a Copy-Paste slapped on top of the old grid-based system from RCT2. The track builder still works with rigid nodes without any form of continous rolling.
I think the Simulation Evolved was mostly aimed at the now infamous Guest Brain. It eats CPU-cyles and FPS like nobody's business, but is it worth it? Guests are so "intelligent" that they become robotic and artificial. Sure, they are nicely animated and look cute, but their actual decisions are unrealistic and even undesirable since they start ignoring path sections that are not efficient or (flat)rides that do not get high ratings by definition. In that regard, I would even state that the "dumb" guests of older RCT games were more realistic. They wandered aimlessly through the park, were tempted into on-the-spot purchases and enter rides just because they stumbled upon it and it didn't look too intense or boring. Of course this was mostly done out of technical limitations, but that's exactly how real themepark guests (should) behave! We visit theme parks to have a care-free day out, away from the boring world of tight planning and budget-related decisions.