Why, in the Spectator Mode, we can't see the "bonus AD" from players?

In the spectator mode, you can see the total AD from any player you want. However, it is always shown as total AD, and the spectator mode does not present the base AD + bonus AD value like on actual games.

It is really annoying because the only way I can know the champion's bonus AD during the spectator mode is by looking at their base AD at a certain level on the wiki and then subtracting from the total AD. However, if they are using Sterak's Gage, then there are more boring calculations. Wouldn't it be better to just allow players in the spectator mode to see the total AD = base AD + bonus AD value like they see on an actual game?

You can also see the bonus AD from a champion by knowing if they have an ability that scales with exactly 100% of the bonus AD. However, very few champions have such ability.