They always seem to be against heirloom resets, we had to lobby hard -- and everybody was happy to get it. It would be a different thing to code but it shouldn't be anything outside of easy possibility.
On topic,
I am all for heirloom resets with all balance patches. I have never seen a single good argument as to why their shouldn't be.
1) "But everybody will switch to what is OP!" -- Fixing stuff like that is what balance patches are for. if they fucked up, And rebalance it afterwards, offer another heirloom reset when it is fixed. It makes everything more fun and Spicy You could say. A free respec should be offered as well with major balance changes tbh.
2) No really, the above statement is the only argument other than "we want to punish some small minority for [insert abuse of thing] so we punish everybody."