How much engineering would be needed? You can not just say "Make it so." Is the building industry in Ukraine at its prewar level? Concrete, rebar, workers. The space to build in. Most times the minimum space needed for this type of infrastructure was used and room to put shipping containers is not there. Just replacing the transformer is a big job. They are probably doing what they can to protect them but from them being hit multiple times seems to say quick and relatively easy fixes are not practical
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Pay for increased capacity? And where is this capacity going to come from?
"Typical substations can take upwards of two years to develop, design, purchase materials, construct, and commission. PODS will not only save significant costs, but can also be designed, manufactured, shipped and installed in less than one year after receipt of order."
ptitransformers.com
"We should..."
We should until the costs come in. Others will counter that we have been managing the system well enough (excluding Texas) and it will be hard to get ratepayers to just say OK to increased costs. Manufacturers who reside in an area will be paying more for power and they will be at a lose as compared to areas where they are not upgrading the systems.