Stay on 1MB has no cost - inherent stability drives price higher - clear benefit.
Go to 4MB is just benefit, nearly no cost.
This is pure bullshit. 4 MB has a lot of cost, unless you want to blindly just increase limits hoping that nothing goes wrong. Somehow, somewhere people tend to forget: resource cost, decentralization and orphans. There is a reason for which Bitcoin has a low orphan rate, i.e. a special relay network.
Its not. Its about to compare with SW max blocksize. So you can say 1.7 or 3.6 I dont care.