You make a great point that a lot of people don’t understand. People like to talk about importance but they forget about availability, you have to factor that together.
Maybe a WR factors into winning just as much as an OT, there are actually atlytics out there that supports that, but which is easier to find?
The college game is opening up and because of such WRs seem to easier to find in the draft in recent history. Not only that WRs seem to be contributing earlier in their career than other positions. If anything OTs seem to be one of the slowest positions to develop once in the league.