I think people just don't have faith anymore. I don't blame them after past actions of oda
However, issue lies with people placing Loki on equal footing with past SHs candidates.
Even yamao doesn't come close....forget about the rest - Rebecca and co who never enjoyed such impactful portrayal like Loki.
-----> Typical SH type backstory
-----> got reference 8 years prior to his arc which didn't happen with any previous candidate
-----> got invited by Luffy and Luffy even declared he will beat anyone who has issue
------> his invitation mirrors Zoro and Brook
------> he seeks freedom which aligns with Luffy's inherent journey. All SHs dream aligns with Luffy's dream.
------> he's massive and zoro rightly called it out...but thing is we also learnt about shipwrights in elbaph. Can't be just a coincidence that oda touched this sub plot in elbaph?
------> his story reflects he wants to sail out.
------> his xebec backstory indicates he wants to be a pirate
------> sees himself as Nika and then Nika himself invited him to join. A simple realization that Luffy is Nika would make Loki be in awe of Luffy or even follow him.
-----> has seen Xebec, shanks, WB, BM, Holy knights and thus ties with them which once again sets him apart from previous candidates.
------> WG is after him and Elbaph doesn't want him - mirros Robin situation ( WG wanted her and no one wanted her ----> nakama void)
-----> wants to destroy the World which could be symbolic reference to the World Government - and, we know Luffy is destined to do so.
I don't know how people can read everything that's unfolding in front of them and then can say - " oh it's like with other past candidates" ignoring the narrative weight of Loki which no other candidate had..... literally no one had.
Loki is special case. Comparing him with previous candidates is like not knowing the nuances of a character development and failing to connect the dots and then resorting to apples and oranges comparison.
Only issue is monster trio and wings of Luffy dynamic. But then, Zoro and Sanji are meant to be the wings of PK Luffy forever. Loki won't replace them... Having Loki means Zoro and Sanji are meant to surpass Loki. A slight deviation for an arc won't dent the wings of the dynamic