@PonyPon
you sound bitter.
Well she certainly lacks an arc (most of the characters do but even they are considered developed), she more than any other character actually displays having learned her lessons.
First is the fact that she rarely repeats a flaw.
Now let’s look at this shit.
LBYS- leads her to having a better relationship with AJ and more comfortable getting dirty (IAT, SS, SW, TY)
Suited - dunno about this one.
SR- Better at dealing with attention, still enjoying it but remaining grounded (Becoming Popular has her enjoying attention but still remains a gracious guest and has her generously support various things the Elites do not)
Green - becomes less pushy with Fluttershy when told no(Filli vanilli) but still wants to push her outside her shell
Sisterhooves - better relationship with Sweetie Belle (Sweetie Toils and even Sleepless)
S&E - more progress with her life goals and becomes more cognizant of High Society’s faults (her micro, the former is a general trend)
As well as better appreciation for friends and community (also a general theme in S4 as she is more affectionate with her friends but it lacks one crystallized point)
SoME- Better relationship with Spike (DQ and other smaller episodes)
All that I can think of. Most of it is capitalized in Season 4.
Very nearly every episode has a payoff.
None of this bullshit “oh she is less X now so development!”