You kinda managed to show an example of what the post you quoted means. The tested system screwed things for nations such as Portugal, Bohemia, Castille, Austria, France, Burgundy, Aragon, Poland among many others and yet people keep insisting it only affects small nations and anyone who liked the new system only play big nations. It made me basically take any complaint that says small nations only as worthless because have they even played the game if they didn't notice that it rendered movement blocking useless for the vast majority of countries?
While I still think the best possible system would be dropping zones entirely and having forts only block movement beyond their province(that is you can only return to where you came from) so there would be actual lines of forts the beta system could work far better than the current one with some tweaking.
Basically remove the free access if the other area borders friendly/neutral and change what counts as neutral and/or not allow hostile to move into that. Would even benefit actual small nations more than the current system does.