I have tested very carefully new alchemy cards starting with principality and county.
No offense, but if I remember correctly from the German forum, you test your fan cards with your wife. I believe you, when you say you two have a great time. And that's nice.
But other people have another level of experience. People who played many 1000 games online. They might have a different point of view based on many years of playing Dominion.
And another thing: When posting cards on a board like this, you have to accept that people judge your cards based on what's established in the game already. If you make up your own rules like adding two new base cards, that's totally fine, but most people here want to play according to 'Donald's rules' and thus be able to mix and match everything.