I am sure someone must have suggested this, but I couldn't find it, so here it is.
Why can't we pick up machines with installed upgrades? 
When you have a big pipeline, it often contains machines of varying power tiers, so some of the machines will require transformer upgrades. 
But whenever you want to add a machine, you have to first turn the power off, because otherwise your machine explodes. 
And whenever I build a fluid reactor it starts overheating and I turn it off and go look for the part of the pipeline where I forgot the fluid ejector upgrade. 