The answer is obvious, you do not look at numbers, because they cause brain damage from sudden strain.

In actual reality, more accurate numbers are better, even though it would be useful to have damage per unit of time shown to have an even better understanding.

It is advisable, that people know the systems in detail, otherwise it is downgrading the ability of a player to grasp game mechanics and numbers without being forced to read files, which is what youre trying to steer steer game devs into, steer people into ignorance, then read the files, be one of those with an unfair advantage versus those who do not know which files to read where.

Perhaps there is not such a zero-sum instigation, but showing even 2 decimals is very fine thing. Same for economy, you see exactly how much things improve.

Rounding for deemed simplicitys sake because you feel like it, would make the players much less informed.

I think it would be useful to have a mode, which doesnt use numbers. When rounding up everything, that you get only a rough estimation that gives a wrong impression. Exact numbers, up to 2 decimals is an awesome feature and trying to downgrade a game because you feel like it ? It is a very self-centered view that would try to worsen the game experience for other players, which you seem to disregard.