I believe that small communities should focus on primaries (Chile, Iran, Switzerland), large communities can afford to focus more on secondaries (France, Spain).
It's not a way for me. And I have two reasons:
1) it's hard to find in our country team which is ready to buy (and train) czech player with salary 150k-200k, our community is very salary sensitive
2) I'm not ready to keep myself players which don't deserve his salary and I'm ready to take care of 3 czech players as soon as I win B3
The skillsum of Player A with HA/DR at 5 is lower by 20 than the skillsum of Player B with HA/DR at 15; but if Player B has 5 primary skill levels more than A, he will be stronger.
I'm not sure about that, it depends on tactic and distribution of primary and also secondary skills. I'm not sure if you talked about inside, outside or all players with example of HA/DR. But secondaries are not just about HA/DR.