Completely agree. The Reds last year were counting on Miley to be that BOR that could win about half his starts. Instead, he only started 4 times and was 0-3. I would hope the plan for 2021 is to have Miley be a mop up guy out of the pen.
Assuming Lorenzen is already in the rotation with Mahle, Gray and Castillo.. there's still a big hole in that #5 spot.
Maybe Antone takes that spot, but that leaves a huge hole in the pen that already needs reinforcing.
I think the best way for the Reds to improve the team is to add a decent starting pitcher. The second best thing to do is to reinforce the bullpen. SS could be backfilled by a cheap veteran or even Farmer. Sure it would be great to add a front line SS, but assuming the Reds have limited funds, I am not sure that spending most of their payflex on a SS is the way to go.
As others have said, we are counting on the 7 non-SS position players to be healthy and work better as an offensive unit next year. (In 2020, they ranked 28th in runs scored per game). If that doesn't happen, then adding Simmons or Didi really isn't going to matter, IMO..