“Ascension Thursday was a choice made by the Catholic Church a long time ago, a tradition.”
Ascension Thursday was no more a choice of the Catholic Church than Good Friday or Easter Sunday was. Jesus ascended to Heaven on a Thursday, forty days after His Resurrection.
Understood. Of course, that is the way it was.
However, the Church decided to make it a holy day of OBLIGATION. They can un-decide it too. They have the authority given to them by HIM.
The Church had eating meat on Friday as a sin. They have undone that. Lent used to be FAR more rigorous than it is now. They DO have the authority to bind/loose, don't they?
In my old age I've become very orthodox in my Catholic practices. I sure don't/can't expect others to be the same. That's not my call.