Your first paragraph immediately reminded me of the logo/CI transition for one of Germany's largest hospital operators, "Helios" (subsidiary of Fresenius):
"old" logo (easily recognizable as a medical institution, easily discernible "H" for "Helios"):
"old" logo (easily recognizable as a medical institution, easily discernible "H" for "Helios"):
http://www.medical-network-hessen.de/images/News/Helios_Klin...
"new" logo ("H" not clearly discernable in the two green blobs, no reference to medicine at all):
https://www.helios-gesundheit.de/fileadmin/_processed_/d/4/c...
All in all, from quite good to meh.