Hi DbT_777,
I've split your comment from another post and moved it to this forum. It felt like it'd make your feedback more visible. Just wanted to let you know.
While I do usually complete the Weekly challenges very quickly myself, often in a couple of games, unless I've got some "grindy" ones, I don't actually mind that. The challenges are nice to have, but I don't personally see them as the main driving force behind me wanting to play the game. That's just me, though, and I'm sure that there are other people, like you, who look at it differently and would really like something in line with what you've suggested.