summoner diversity: flash cant be deleted, but it can be replaced
when it comes to summoner spell diversity
has been an issue since season 1. it has become a crutch that is integrated into the balance of the game to a point that some champions wouldnt function properly without it. 10/10 champions take it despite multiple nerfs to cooldown and range over the years just because the versatility it provides in any situation.
it has become the number 1 means of escape and engage in most situations of any champion and is one of the most important cooldowns we have available.
from jungle ganks to skirmishes, one of the first and most important questions is, does your opponent have flash?
that doesnt mean that we need to keep it. instead of an all purpose summoner that acts as a tool to make offensive and defensive plays, it could be split up into several more specialized spells/item actives.
a more balanced version of
fit for summoners rift could replace flash as a tool to make offensive plays without at the same time giving reliability and escape potential that flash offers. (the champions who would be the most interested would be melee fighters and tanks).
while the escape potential could be provided by separate spells or item actives like
(more attractive for squishy adc and mages)
summoner spell diversity should mean the choice between
for aggressive plays
and
for defense and escape
and
{{summoner:2}}
for utility and map control.
and should be chosen on a champion by champion basis. which champions need the extra ability to engage? which champion needs reliable escape?
this can only be really accomplished if flash doesnt crowd out other summoners as offensive and defensive ability, because it provides both.
instantly God tier.

with cleanse or QSS
some need it as a tool to escape (usually marksmen)

, pretty much every champion that was ever designed as a jungler was designed to be able to gank effectively against targets who had Flash up. If you can't Flash away from these champions their ganks become GUARANTEED KILLS, especially with the targeted movement speed steal from
.
