it's not an issue of micro. for the first 30 seconds the spio will win any encounter, provided the user has a modicum of sense and doesn't try to charge IS or riflemen in green cover from max range.
it basically guarantees OKW any building on the map. same shit happens with pios, CEs, or RETs though, either by trying to fight with a shitty unit or by building your t1 and letting them have that first 30 seconds for free.
It is a issue of micro = A, you have to fail in positioning your units correctly to counter the spios and B, he has to somehow manage to sneak next to you.
And again, you need to have all your units in one place, not all over the map. Against okw you need to be defending in the first 2~ minutes.