For the last few years or so, when I get PCBs done up for me by an outside company, I am ALWAYS putting in loads of extra thru-vias, at the PICs pins, at the components, on long runs, etc.etc. (except on things like crystal traces and anything really sensitive to spikes)
If I find a mistake, all I gotta do is cut a trace, and install jumpers across whatever via's fix the problems.
Sometimes I've got what looks like thousands of via's, but it works.
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