Such a ridiculous feature should not exist first of all IMHO. Ate least not according to my view about what the future game path should be.
Now it became a little less horrendous and people complain because they cant gamey the game that way anymore.
I think here is the answer to the question of why the game became worse (for MY tastes) over the patches. Because of the player base. PDX (and now Tinto) know many players just want op features. And at the same time they want to increase the player base making the game easier.
At least the new mechanics for concentrate is a kind of compromise between those players who think it is interesting to conquer 2000 dev in the 1st decade and those players who think the mere possibility of that makes the game plainly stupid.
Of course different people, different tastes.
Part of the player base would love to see that feature simply wiped out. Other part would love it remained that op. The same way part of the player base would love to see 200 new tags representing many Amerindian tribes, while other part of the player base would love to see empty North and South Americas (and Oceania...). And so on. Instead of just part of the player base being VERY upset with concentrate while the other part was happy, now everyone is just upset. Yeah, not good, but equitable. It is not easy to find a balance for such contentious mechanics.
That is why I am quite pessimistic about EU5. It seems to me the EU-series player base is more heterogeneous about what they want from the game. On the other series, CK, HOI, VIC, players disagree in many things, but the general vision about the focus of the game is quasi-homogeneous among the players. Even such radical decision like the one about warfare in Vic3 has an expressive majority sharing the same opinion of approval.