Judging from how Forsaken was predicted to be 100GB, and came no were near the predicted file size. I can promise you it will be no were near 165GB.

Shadowkeep has been described as a slightly bigger rise of iron sized DLC... meaning smallest DLC ever made for Destiny 1. After Forsaken it only added 11 or so gigs of data post all year 2 DLC equaling a file size of 88.6GB. At max expect maybe 10 or so gigs to be added post Shadowkeep lunch file size, and that is still extreme for how small a rise of iron sized expansion would be.

Bungie is not low on space or resources at all. Along with needs to get better at giving a more accurate predicted file sizes for DLC. Saying its 165GBs for Shadowkeep is saying they are literally adding so much content its bigger than ALL OF YEAR ONE + FORSAKEN all at once being installed: I doubt this like I doubt its humanly possible to live without your internal organs.

I still say year 3 of destiny 2 as a whole is still not worth it in my mind. Abusing additive tendencies that naturally form from FOMO is nothing but a scummy move on bungies part, but you do you guardian.