So, basically what you're suggesting is that a "grown up" person and someone who has "matured" is soemone who is "NOT AFFECTED by joyful, scary, and other aspect of adventurous life."
alright, see it as you please... I'm not going to argue about characterization when we both have DIFFERENT VIEWS fundamentally about what "maturity and growing up" supposed to mean.
Where have you seen things like "Zoro is not affected" by things... Are you sure there's nothing in that's affected Zoro post time skip? Or are you just saying he isn't affected by things you THINK should affect him? Or he reacts in ways you don't think he should react?
For example in punk hazard, Sanji shouts at Zoro to protect Tashigi and Zoro ignores him. This is Zoro after 600 chapters of showing he doesn't respect Sanji's chivalry bullshit he doesn't even have to react and that already tell the readers enough about what Zoro thinks of Sanji. Plain indifference.
Next Zoro seemingly acts shy by holding back against Monet and it's revealed that he just doesn't want to beat up weaklings. That's a reaction to a situation only Zoro would have, RESTRAINT. And then when Tashigi comes in, Zoro gives her chance to prove herself to him and she does a semi decent job. Zoro then congratulates her for the first time ever in the series. Pre time skip, Zoro's entire relationship with Tashigi was him falling on his ass after seeing her then post time skip he's no longer a bumbling idiot around her and tells her he doesn't respect her because she's weak. Then when She takes out Monet, he acknowledges her for the first time as slightly less weak. THAT'S MATURITY. From falling on his ass around her pre time skip to acknowledging a little growth in her post time skip
These are all reactions Zoro has to Sanji Monet and Tashigi which are explicitly different from the reactions he would ha them if he was pre time skip Zoro which are all characterised by his growth. He acknowledges Tashigi, ignores Sanji, and is restrained in beating up weakling Monet.
Next we have Dressrosa where Zoro's immediate reaction to the tontatta is pure irritation. Remember that tontatta are introduced as thieves and this only affects Zoro. This entire aspect of the tontatta was created to only affect Zoro since Wicca stole his swords and so the obvious reaction Zoro has to the tontatta is irritation. Wicca then goes on to hang onto Zoro for a while and beat him up whenever she throws a tantrums and it's made clear that tontatta punches are like getting hit with hammers and this chick kept hitting Zoro any time she wanted over nothing and so Zoro's continued reaction to her remained IRRITATION
So once again here you are ignoring context saying Zoro should've had an immediate "Kawaii desu" reaction to some chick who stole his swords and beat him up all the time.
And continuing this, Zoro was pretty JOYFUL during the Dressrosa party, very WORRIED when Fujitora turned out to be an admiral, Very EXCITED when he got to fight Pica and even DISSAPOINTED when Luffy entered the colosseuem fighting tournament without him.
These are all Reactions Zoro has had all over the post time skip and I wonder again whether you just wanted him to have different reactions even though we know who he is or just don't recognize that he grew as a person
Like if you want whacky reactions Oda even threw in the Pica voice gag that even Zoro laughed at since you want Zoro to just react like everyone else even though Zoro never did that even pre time skip