In the industry I work in, I think it would be fair to say that Brexit has failed, in trying to complete something today, Brexit has caused a complication with a smallish financial impact, and with probably a 2 week delay, on a project that is currently approx. 18 months late,
the extra two weeks isn't a biggie!! (18 months sounds a lot and it is, but factor in C19 and steel supply problems due to the conflict in UKRAINE!!
I would also add that being in the EU for the period that we were, in the same industry, I would also judge it as a part failure in that much harmonisation of standards didn't happen and it should have IMO. Now having had some time to reflect on the leave, I've not seen any positives and the negatives have been minor, a big exporter I would guess will have had a difficult time.