Where does Bitcoin fall short?

Particularly for the Bitcoin maximalists, do you believe that Bitcoin is perfect and could not be improved?

If you do feel that Bitcoin is perfect in its current form, do you see the network congestion (such as what we experienced on the day of the halving and the days following it) as a necessary thing that we will all just accept sometimes as a natural part of using the network?

I don’t ask this in any threatening way, I am both someone that owns Bitcoin and runs a node to support the network. I just see particular areas of the network as possible barriers for mass adoption and I’m trying to see if I am missing context in my own analysis of the asset.