Why should the user do that? The project should do it with an automatic build script. Every open source project worth mentioning releases also portable ZIP pac

Why should the user do that? The project should do it with an automatic build script. Every open source project worth mentioning releases also portable ZIP packages of the software. Mozilla's Servo windows builds get released only as MSI - why? (BTW their win builds were available already for many months, just not linked from the frontpage, see bug tracker for more info)