as far as not upgrading, i did have my corps set to not upgrade, efficiency, and recently started them upgrading again.
the country i'm talking about, has a natural increase of HLW, at 260M, which no one else is able to do. upgrading would lower the demand of HLW, but it kicked my ass, mostly in the HLM catagory. so i had to stop upgrading, to catch up, which i did, by raising my priorities to adjust. the funny thing is, while the need for HLM became terrible, it put allot of my other professionals out of work. before making adjustments to my priorities, these catagories, that where naturally increasing, started declining, do to large numbers of unemployed, even tho i need them to go back to work. so i had to focus largely on the biggest problem, HLM, until that was more level to my other problems, and fix each professional, in the order they where hurting. tell eventually i was able to fix them all.
and this was with an EI of 100.
another thing to note, as an aside, is the LLW age categories, in older countries, you see a reverse bell shaped curve for the LLW, with allot of LLW at the younger ages, and the older ages. how ever, this is pretty much the only worker/professional category like this. what happens when you have a large amount of unemployed professionals, is they are demoted into LLW, and it seems that its the older unemployed that are demoted, in the long run, i think this runs a muck the MLW/HLW process.
with my above experience, i noticed along with the decline of unemployed, yet needed professionals, their was also a significant increase in the older LLW catagories, meaning that the "obsolete unemployed," that where being demoted, where mostly the older ones. once i got things working again, and training just enough for a moderate increase in each profession, i noticed the older LLW declining. when i compair my country to countries having consistant HLW problem, they have larger numbers of old LLW, MLW and HLWs. So over training, results demotion of older workers, that round about fill the HLW worker ranks, then quickly retire. or so it seems
so thats something you got in your favor, TC, if you over train, it ends up screwing up your work force. it doesn't happen right away, it takes a little while for it to kick in, and when it does, you (not you, from your post it sounds like you get this, generic you,) will think that its a game bug, because it always worked that way, when you didn't really get, it that it never worked that way.
going with more agg and mining, low brow type corps, stabilizing the work force faster, with less future problems, this much i know for certain. my next step, is to find a healthy transition from a agg/mining econ, to industrial/tech econ. as it works in the real world, it should work in sim country.
but as in the real world, factory didn't just appear, the local econ, nearly always started with some natural resource, which drew people to the area, then as the local economy evolved, it became less dependant on farming/mining, and more on factories and technology.
i believe that, going for heavy tech/industry right away in a country, will have long term worker problems, you must first stabalize your force, with a low EI, low HI, and low tech corps, and mature your country. but if you go straight for those HT corps, you'll over train, drawing to heavily from your HLW, creating long term problems. so the short term success, has long term problems. that players often misunderstand as a bug.
sim country is a long term game, i've been playing for 9 years, their are people that have played longer. if you really think about it, their shouldn't be a issue with spending a couple years maturing and developing a country.