Allowing cross-save allows you to maintain your progression regardless of which platform you’re playing. Can move your guardians to a different platform and freely jump between console and PC at your leisure.
There are a few important disclaimers to keep in mind before you go through with activating cross-save for your account.
When you log into your account online, you’ll be able to see which platforms have access to which content. chabungie provides handy links to where you can repurchase the expansions and season passes.