Essential physics builds progressively a complex universe since fundamental particles contains the ways up to complexity. That is to say at fundamental level: entropy + open sub-systems in a universe with the same origin, that is interacting and producing emerging properties with pieces of subproducts already makes universe evolving toward more complexity (despite the lonelyness of entropy).
Intuitively a complex universe may not 'split and slip back' by succeeding to reproduce, thank to metastable equilibrium / reproduced critical transformation like by what we would call 'complex locks ahead up' or 'brakes for reproductive emergencies'. Formally this can look like different from right straight slopes up. For a visual display of the sort of complex mechanisms that can look like closer to this sort of mechanisms toward more complexity.
Now, of course this does not mean that all such universe should, as a whole, turn nonsense physics. The possible is made from the discrimination between local and global, particles and field (enough filled with material ressources), environment where 'raw materials can be extracted: energy, matter and so on. But at the same time and this is where is the curse (higher than the one of 'commons') promoting over or after-all more disorder.