I think that's exactly why us fans are where we are, with some of us thinking that the Rams are blatantly ignoring the offensive line to the rest of us saying that they just plan to develop their own talent. If you take a look at the Rams history since 2017 they've done the following:
2018 draft: drafted Brian Allen and Joseph Noteboom. I think Jamil Demby was in the same draft? I'm unsure.
2019 draft: drafted David Edwards and Bobby Evans. Two players that they plan to develop but got thrusted into the action due to injuries. Play decent and one of them ended up becoming a full-time starter. The other may become a full-time starter this year.
2020: drafted trey Anchrum and raved about him but did note that he needed development. Maybe he ends up starting this year. I think there will be an open competition there.
What I'm getting from this is that the Rams don't like going into new seasons with a completely revamped offensive line. They'd rather develop the talent that they have and let those guys grow into their places. I suspect this is what we're going to see after next season. 2022 will probably involve trying to retain Corbett and Joe noteboom. I don't think they'll be too afraid if this becomes two pieces of their starting offensive line. Note boom looked good and limited games last year and Corbett was one of the better guards in the league.
But to agree with the other poster, it seems as if the Rams have a plan in place. I don't think that they're flailing around and they've shown that they like to draft offensive linemen early so that they can develop them down the road. So the fact that they aren't spending high capital online men in 2020 421 suggest to me that they really do like the depth on their own team. It may not be a plan we all like but it is their plan