I think mostly about the noobs this time, they would benefitted from it, and it is fair to give the troops a little extra stats when you have two of the same races in the team. Currently a bonus only get triggered having 3 or 4 races in the team.
I’m not new but I definitely support this.
The bonus for a color is even worse, you need a full team of every troops having that one color in their colors.
I think especially for magic it would be nice to reduce it to 3 even if the bonus would not increase with having 4.