I'd say Sony has always been about exclusives 1st and 3rd party, ontop of being a 3rd party powerhouse.
Its what made them stand out from Sega and Nintendo.
Games like GT, Crash, GOW, SoTc, PS1/PS2). Either by sales or huge reviews made there 1st party respected
There 3rd party exclusives like MGS, Tekken, Final Fantasy, DMC defined there 1st 2 consoles. GTA timed exclusives
Nintendo and Sega didnt get games like Parasite Eve, XenoGears, DMC, Onimusha, Ridge Racer, Silent Hill, Tomb Raider 2-3, RE3 and hundreds more.
They were an exclusive powerhouse.
During the PS3 it was Uncharted, TLOU (PS3) breaking there first party records and winning GOTY.
PS4 also had so many exclusives 1st and 3rd party exclusives for the time. From GOW 2018, Bloodborne, Persona 5, Detroit etc
They need the balance, 1st party, 3rd party exclusives, and being the most stable 3rd party console