Completely agree w/everything that's been shared so far. I've spent close to 2 decades, shuttling between both levels - GO and SL.
Honestly, there isn't much difference and value -- to me -- between both.

As a person who flies via HKG primarily for connects, the biggest value from having status is J-lounge access (which SL already affords).
Every other perk that comes w/GO, I've hardly enjoyed (I don't need 50kg luggage space, nor have I needed priority standby/waitlisting in 2 decades of corp travel, nor care if I board first w/Biz, or 3m later in a separate queue lane).