I don't think that Tactics is a good example for the point you are trying to make. I'm not saying you are wrong, just that this skill is flawed, as I see it, in a different way. To my thinking, it is simply paired with the wrong attribute. I think INT makes much more sense. Problem solving ability and memory would be more of an asset to someone trying to figure out the best tactical moves than, and you say, "abstract education". If it were based on INT instead of ED, then it would make far more sense that someone with such a high intelligence but less training/experience could match wits with a dullard with lots of training.To add to this point, T5 describes as 1 skill level representing, generally, 1 year of training in that skill. And, in the above example, even with the TIH Rule, we see a character with 2 years of tacitical training having a higher chance of success than a character with 5 years of tactical training--all because of general, abstract education.
Now that being said, I just had a thought along these lines that I think may support your point. If we were to, for the sake of argument, take the CT/MT attribute and skill balance as a baseline and compare it to T5, what would we get? Skill 3 in something was the same bonus as you get with having an attribute at 15, because the attribute was divided by 5. Now in T5, skill and attribute are added together equally. This means that attribute of 15 should be equal to skill of 15, and by that logic, attribute 7 equal to skill 7. Now in CT/MT terms, this would be equal to a skill of 1, which we saw all the time. But in T5, how often do we see skills of 7? Or even 5? Not very often in my experience. So I think that the problem is not so much that the skill and attribute are weighted the same (this happens in most RPGs that I am familiar with, because it is simple), but rather that our characters get so few skills in comparison. And sure, they may get a greater number of skills than in CT/MT, but this is watered down by the fact that such skills are random, across many possible charts, making the statistical likelihood of getting any one skill multiple times less. See what I mean: In CT/MT, it wasn't that hard to get a skill of 2, equal to a stat bonus of 10. Now how hard is it to get the same skill 10 times in a row in T5? Near impossible (outside of formal education anyway) I'd say. Instead, I get great heaps of skills at levels 1-3.
So I think that therein lies the problem, and either characters need more skills, or players need more say in which skills they get so they can concentrate them better.