You have the right to disagree but you offer no reason for disagreeing.
Here are the reasons I think heirlooming with alt should be allowed.
1. You still have to put the same or more of time to retire as with main (main usually higher gen so would be quicker getting looms on it)
2. Changes to items/upkeep. The devs are constantly making balance changes (which they are doing a great job on) so looms you did before you stopped retiring get nerfed or changed dramaticly. For a personal example I heirloomed the items I wanted before I stopped retiring but updates to upkeep costs make it so I can't afford that gear anymore. I can grind in cheap gear (not leaching) for hours and hours to afford buying a loom. (which I have done)
or they could allow me to play on an alt using normal gear and after retiring transfer to main so I can afford heirloomed normal gear on main. I think allowing heirloom (not gold) transfer is less disruptive to gameplay.
3. People will get the items anyway so we need to balance for the future not the immediate.
All you are doing by disallowing heirlooming for people with over 31 mains is making it harder on the people who are really keeping the mod vibrant. I will eventually get the heirloomed items i want, would you rather i got them by playing with my level 34 char slowly getting gold or leveling up another char which is what you say will keep the game balanced. (not leveling my main to 35)
The reason's are self explanatory. If you make the decision to keep leveling beyond 31, you have clear advantages towards your stats. One of the things that you trade off, is the ability to loom more items.
At least now for people still trying to obtain looms they are able to do so with their alts. I don't think it makes sense to allow people to get MORE looms on their main without retiring (other than grinding gold, which would take a hell of a lot longer to make 400-500k than to retire an alt).
And to your question, I'd prefer they kept the old system, the looms are tied to the characters. I don't think you should be able to level a guy up to 34, and then keep retiring alts to make looms for your level 34 character. I think that's too big of an advantage. If you want to keep getting looms, keep grinding the gold, or keep retiring your char. Seems like a good balance to me.
Otherwise you get into the balance issues. People who have played the longest, and put in the most time are already going to be the best players (generally speaking, because they've put in the most time getting "good" at the game). But then you throw in extra stats (if you're over level 31) and better equipment (looms), and now you take a player that by all means should be better than the rest of the field (if you had equal stats and equipment) and just made them even better. That's one thing I never liked about games where you "level up" to unlock better items. It becomes less focused on skill, and more focused on who has the best pixel crack.