As you said it is your choice to delay, but yes I'm sure they could adjust it.
There are a few reasons why they "can't" or won't
- it is balanced so that you cant easily hit the raid limit and be locked out of rewards.
- it keeps people active and keeps things rolling forward
- it limits the buffer, keeping people active on daily 600
You also have 3 days to do the raid, with a 24 hour join and 2 days to do the raid. This this setup you could easily postpone a raid for 1 day and still launch it at the same time to not lose tickets.
