Do we still need Down migrations? Taylor says No.

My view on that recently, in a past year, has been that you just never rollback. Ever. You would always go forward. Because I don't know how you roll back without losing customer data. At least for my own projects like Forge or Envoyer, I could never really guarantee that I wasn't losing data, so I think if at all possible, what I would try to do is write an entirely new migration that fixes whatever problem there is, and it would just migrate forward. Sometimes, if it's low traffic, and you feel pretty certain that no one's messed with the new database schema, then probably you could just roll back, but.. I've actually stopped writing down() methods in my migrations entirely, recently, now that it's optional. But it's really mainly feasible in Laravel 5.5, cause you have the new db:fresh method which just totally drops all tables without running down methods.