There are all sorts of ways they messed up with that test, the design of the system in general, etc.
A lot was learned, some of it costly stuff that we as a species really didn't need to pay for again, and some things that were new and valuable as a result of failure that ethnically could never be intentionally replicated.
One of the better lessons might be to avoid deviating from pre-planned test procedures, and for every major step to have an 'abort' path (or two) for safely entering either safety or normal operating procedures.