Jhoira is good because of card draw.
Jhoira draws cards under more circumstances than Reki.
Reki is green (ramp is nice) and costs 1 less.
Reki is still less good - that is not the point - there is a wide gap between Jhoira and Kongming, and a still very respectably large gap between Reki and Kongming.
Play against both a well-made Kongming and Reki deck and try and tell me they're remotely comparable.
Or I guess while we're on the subject compare Adeliz with Gosta Dark and
Myojin of Infinite Rage which somehow are in the same "tier".
Adeliz is like a crappy shu-yun which is still massively better than a 10 cost mono-red commander or a 7 cost 4/4 with a useless ability.