copy+paste selected parts: QOL, preferably with connections/wires
reintroduce gate delay:
gate delay allows creation of edge detectors etc. and can introduce timing issues, which makes creating pipelined circuits a must when working at higher clock frequencies.
making such a pipelined circuit circuit work is very satisfying.
It also makes it relevant to look up different types of adders. without delay, the carry ripple adder has no downsides, but there are far faster versions, eg. the kogge-stone adder.
If I remember correctly, the ALU is the slowest component in IRL computers.