Now that the red numbering has been out for a while on the squad/player pages I have realized how much of an improvement / time saver this is compared to having to open the training graphs on each player to check for maxings.
I would love to see this rolled out to the transfer market too.
I know some still like to hide maxings, and some don't like to reveal to non-CM managers, but I think these are outdated. Personally I just skip players when their maxings are hidden, and the only benefits of hiding maxings is to either 'trick' another manager into overpaying for a maxed player, or potentially manipulating the market to transfer to another manager who knows a player is unmaxed than they would have sold for if the maxings were open.