The first part about the investment isn't relevant, since this wouldn't be the first time something like this happened (anybody remember when final hit became poop? Or when elemental reforges became poop?) and it's more or less expected that at one point stuff devalues.
The 10x rate for excellent/inspiring sounds nice on paper, until you realize it only really gives you a noticeable boost if you have excellent/inspiring rate reforges.
In fact I think it ONLY affects the values for reforges, now that I did a bit of math:
This is the formula that the wiki claims is being used:
Specific Performance Rate / [Normal Performance Rate + Excellent Performance Rate + Inspiring Performance Rate]
And according to the wiki, we get these base rates:
Nb = 206
Eb = 75
Ib = 15
Tb = Nb + Eb + Ib = 296
This gives the following percentages:
20600/296=~69.6% for normal
7500/296=~25.34% for excellent
1500/296=~5.07% for inspiring
Now if we account for the supposed 10x increase for a HS (if it were to affect the base rates, and not just the reforge rates), we would have these numbers (the link bonus only mentions that only the excellent/inspiring get a 10x boost):
Nhs = 206
Ehs = 750
Ihs = 150
Ths = Nhs + Ehs + Ihs = 1106
This gives a percentage rate of:
20600/1106=~18.63% for normal
75000/1106=~67.81% for excellent
15000/1106=~13.56% for inspiring
Now I don't know about other HS players out there, but for me, without having any excellent/inspiring rate reforges, I sure as hell aren't pulling an excellent performance more than half the time 🤣
It's safe to say this 10x ONLY affects the rate you get from reforges, which is an EXCEPTIONALLY scummy thing to add in the first place...
And apparently it's not the only place they did something so scummy, apparently for SG they also locked some link bonus behind a reforge:
https://www.reddit.com/r/Mabinogi/comments/1lyy20g/localization_strikes_again_sg_link_5_issue/