This is what people really dislike about your posts.
You just posted:
1. 21/20s still drop!
2. For most, 3% isnt anything tangible.
3. It's a feels thing.
4. The difference betwene 21/23 is a waste of currency for the rich guys.
5. If you want it, you have to make it yourself from alva.
Yet, what you didn't address is -- if these are all true, then why would GGG prevent them from dropping? #5 on your list is the only one that could give any explanation, but alva temple ALREADY gives you an advantage -- it let's you target the gem you want to attempt to 21/23, rather than leaving it up to RNG to get a 21/23.
So what you posted, if it was true, just proves that GGG didn't need to prevent them from dropping.