Alright, so that's in fact a bit confusing. What you (Hagson) have quoted suggests the staff is ok with using summoning locks for endgame purposes, whereas the first post of this very update, and the measure itself that was taken, specifically limit the summoning of high level characters implementing a higher level requirement for locks to be able to summon them. I thought that was indeed what was being frowned upon, using locks to get to world bosses faster, because that all revolves around abusing free accounts to get an advantage over a "common resource" (as world bosses are) where the only way for others to compete is abusing the same way themselves.
I personally believe making such distinctions of little practicality: to me, there's no difference between a leveling player using locks to bypass flying paths (thus leveling faster than players who travel normally) and whole guilds turning to the same mechanic (thus getting to world bosses faster than guilds who travel normally). As a matter of fact, an advantage is being gained that cannot be compensated if not by resorting to the same method, regardless of the "outperformed" subject being single players or whole guilds.
Of course, the solution I suggested can effectively counter a wide, organized usage/abuse of said mechanic by the hand of guilds (assumed the staff wants to prevent it on a guild wide scale at all, which doesn't even seem so at this point), while it's clearly of no utility for isolated players going around on their own. For those, the newly introduced limitation is probably a good countermeasure, yet how do we go about legit players unfairly hindered by it? Players who are getting camped, for example, and want to be able to summon a much higher player than what's permitted with the current limit, if they have a chance, or want a dungeon boost. That can be done through exceptions, if technically feasible: as in, locks nearby any dungeon entrance could have the limitation automatically lifted (a "filter" which is triggered when entering a given subzone maybe, getting disabled again when the locks leaves it).