I came up with the same idea for treating autoimmune disease years ago - in my first year of med school, actually. Back then the platform for doing this elegantly via mRNA didn't really exist, though, and I didn't want to drop out of med school to spend a half-decade or more in grad school proving the concept the clumsy way. I'm really glad that it's finally come to fruition, but I definitely feel a bit of regret tha…
Don't feel too bad, the execution depended on a massive world-changing pandemic where funding flowed freely and normal economics just didn't apply.
It wasn't the economics that didn't apply... it was the safety protocols and ethics surrounding the processes of altering the genetics of human tissue.