I don't know how much of a resource this would require to change or even if this would be wanted by the community. However, I think not being able to see the competitor's battery % or when they are using boost would definitely make the racing more exciting/frustrating (more emotional) and add a level of mystery until the last lap.
DRS trains would be harder to maintain and this could potentially lead to players overboosting which is a skill in itself in my opinion to not use too much boost when necessary.
If the visual boost animation/graphic can not be removed completely then maybe atleast a delay on activation?
I know IGP is an arcade game but as mentioned I think this simple change would give races much more suspense.
I did a quick search to see if this suggestion was mentioned previously and couldn't see anything similar, I apologize if this is a duplicate.
Thank you.