Hey i have some reasons why not to implement this:
Game losses are implicitly visible in other statistics
If you can see all the games played and games won, you can easily calculate how many games someone has lost by simply taking the number of games played minus the number of games won. Loss statistics would therefore be redundant information.
Focus on positive performance
furthermore I think that negative statistics are not necessarily necessary because it is negative anyway
Loss statistics do not provide insight into individual performance
A loss does not always mean a player performed poorly. A player may have played an excellent game but lose due to an underperforming team or bad luck. Tracking losses does not accurately reflect an individual player’s contribution to a game.
Not every player plays to win
Some players play for fun and experience, and not necessarily to win every game. For these players, losing statistics could be irrelevant and even distracting, as it does not reflect their playing style or motivation.
Conclusion
I personally think you are not getting any relevant information out of it, which on the other hand can have a negative impact on things.
Nubnub