I know shield spam was awful, but don't go overboard now that you're addressing it.
all getting their durations halved,
decays, and
got his nerfed as well last patch. These on their own are good moves, now that 45% CDR is an easily acquired thing shields had stupid uptime once you got a couple items.
But these aren't the only shield changes going on in the ecosystem. FotM is gone, and now the items with bonus healing and shielding passives have nerfs on PBE. Additionally, anti shield mechanics seem to be the new "3 hit passive" for reworks and new champs.
execute ignores shields,
will have grievous wounds style reduced shielding on his passive,
has shield shredding,
ult prevents shield from saving you from the meat grinder.
Just saying, maybe you don't need to halve a bunch of shields strength if you're curbing shield power elsewhere and adding anti shield mechanics.