Please make us proud of ext4

Yes, make us proud, by actually using the filesystem's capabilities and not further discouraging the proper use of fsync (not overuse, such as firefox is/has been prone to...) by keeping it unnecessarily slow (which alloc-on-commit will do).

The kludges for alloc-on-replace that will apparently be enabled by default should deal with the real, problematic cases of loss of pre-existing data quite nicely, and I do think having those as defaults is a good, reasonable compromise. Those who want to be extra-paranoid with either nodelalloc or alloc-on-commit, well, sure, the option is/will be there, but I don't think these might I say somewhat obsolescent modes should be the default.

'course, distros shouldn't use ext4 per default yet anyway for conservativeness sake. Maybe starting next year ;]