Most users won't need 4TB of storage, but it's a good option to have for those professional users who do need the extra capacity.
What is the use scenario where one would need (or even find sufficiently convenient to justify the price for) 4TB of internal storage in a laptop?
- Professional photographers who wants to carry their entire RAW library with them
- On-the-go 4K film editors that don't want to deal with external HDD
- Rich techy dads who want to carry the entire video library of their kids with them at all times
- Rich people who just want it