The guaranteed 5* with 100 gold gives a chance to draw only 7 different girls. Not sure if getting only one of these 7 girls is better or not than getting the 4 same SR everytime.

So ok, lets forget about weapons and eidolons and focus on girls.
If i trust the both wiki, FKG (japan version) has 55 different events, wich means 55 5* you can get for free during events.
KH has something like 10 SR girls you can get from events.
Considering that FKG is more than twice older than KH, we can guess that KH would have more than 20 girls at the same age (i leave the exact math to Sanahtlig )

So you can get more than twice the amount of girls from FKG events. Does it mean FKG events are better? Nope.

Because game mechanics are different. Because knights in FKG are the main element of your team.
Cause you while you need only 4 kamihime (6 if you count sub members), you need 20 knights.
Cause 1/5 of your team is composed by a soul of your choice. And you unlock her for free...

You say Eidolons are nowhere near equivalent to members of your main team. I disagree with that.
SSR (and some SR) Eidolons, aside damage they are doing, gives you extra ability like ATK buff or cleanse, which will directly reinforce your team.
Even if its less than weapons, they also buff your stats, making even crappy R hime useful (and yeah, i know it wont buff their crappy ability).

An example :
Michael lvl70, SSR light balance, 1348 hp/ 7369 atk > 3829 hp / 20882 atk after weapons and eidolons buff
Orpheus lvl 1, R light balance, 186 hp / 718 atk > 2665 hp / 14240 atk after buff.
And the more you'll have maxed SSR weapons and eidolons, the smaller the difference will be.

Good thing we can have these SSR from events for free. And good thing there are more events on KH than FKG (32 since 2016/04/04 vs 55 since 2015/01/30)

I completely agree that Gacha is a mess on KH, but aside that, the game is fair. The reason you think free stuff is better on FKG is based on personal feelings, not objective facts. These games are simply different.

I could continue with dress/skillbloom vs break limit, harem content (cause yeah, harem isnt only hime), lategame utility of the 3* 2* you can get during main story vs utility of these poor 4 hime you refuse to love ect.
But this post is too long already and i guess this talk wont lead us anywhere.
+ i'm not english and i spend too much time to write things correctly.

Peace mate, hope you'll have fun despite it all