I think Donald is opposed to actually changing what cards do, and would rather introduce a brand new card. And so far, they've always been full reworks, and not anything like what I posted here. The only exceptions I know of are making things explicitly optional if they would lead to "or prove you cannot" situations.
It would have been great if I could have just changed cards for the 2E versions. I would have changed lots of cards.
The problem is that the players hate us then. You bought the inferior Seaside, now we're selling the fixed version, you can't get the fixes unless you buy the whole box. Well look at how we're trying to bleed our fans and sell them the same thing twice. We're the worst, for fixing up this expansion. We can sell just the new cards separately... except, that product is awful. Here's the product to buy to get "you may" added to Throne Room and Moneylender; any takers? In some cases the card gets worse, e.g. Fool's Gold losing the reaction; it can be hard to see the merit of the change. But if you want everything you have to buy this awful product, we're still the worst.
Aside from that, it's bad to change cards because it leads to people being used to one version and then playing someone else's and arguing about which way the card should work. This doesn't prevent changes but pulls the other way.
So what happened was replacing cards, except for a few cases where the change was very mild and I thought I could slip it through, and Possession dealing with the existence of debt. And I mean there are still people mad that they can't buy a box with just the cards from Guilds that say "Coffers" on them.
Finally, this isn't the place! There's a forum for posting homemade cards; take it there bub.