Well, it is widely known that PC hardrives are big and provide great performance to satisfy any gaming library, meanwhile console hardrives are tiny and disappointing.
PS5 800GB is just pitiful. Even though PS5 comes with the slogan "It's not about the size but how you use it", lets be honest that's not enough for modern gaming. With subscription services such as Ps plus and Origin Prime or Xbox Live, that's not enough. You will have to install and uninstall games all the time. 1TB is not enough by modern standards. Even with expansion slots, you can take it to 2 TB, but that's still not enough. External drives are not good option as they are expensive and slower than internal drives (the fast ones require a separate power supply too)
Men, my original PS4 can only hold like 3 games at once.
PS5 storage capacity is just a very small jump from the original PS4. Not even mentioning expansion SSD cards will probably go for a premium price and shit.
My PC in change features 8 TB of regular HD and 3TB of SSD. Only investing in that much storage allowed me to play comfortably and take advantage of all subscription services and sales that happen today.
But the problem is consoles, being tiny boxes, do not provide enough internal slots to wield a massive storage drive capacity like PC can.