You missed the point. If all +2s were upgraded to have the same stats as +3s in your best case scenario then you've now got 100 of these weapons on the market instead of half a dozen. This is what devalues them. I make about 8 +2 crab bows for every +3 yet you seem to suggest they should all be converted to be of equal value.
I don't mind a change to the HQ result if done right but current items need to be left alone. Replace them all with better items if need be. I've long been a fan of making every item currently in the game obsolete and starting again with new materials where supply is more restricted. There's way too much iron ore, logs, other ores and whatever else flooded around the market.
It's interesting that the post mentions 4x electrum ore = electrum ingot. I wonder if gold sand/ore is going to become electrum sand/ore and then have an entirely new market for gold when the level cap is increased. Something else I've been a supporter of. But that's probably a translation error.