I don't think there is any other reason. Simply because you have improved the code and commented on its apparent soundness (and known and potential weaknesses)
I must say I'm a bit taken aback that you think exchange rate being displayed in a wallet is "interesting" but I guess that is in the eye of the beholder.
I don't think that adding in the exchange rate is technically interesting; I think it's cute and somewhat useful. But it's "interesting" in some sense that he's continuing to make UI improvements and experiments in the wallet -- I like that. Again, keeping in mind my view of crypto in general as a fascinating experiment, with cryptonote as a really intriguing advance that trades some bloat and other issues for anonymity in a technically and socially/financially interesting way.
The ring signature pruning is technically interesting.
So -- what I'm being most positive about is the continued development along directions not necessarily being explored by Monero or any other cryptonote coin. That's good for anyone who thinks that there's value in having technology for anonymous transactions. If things like blockchain aliases turn out to be dumb -- great, we learned something. If they turn out to be wildly popular -- same answer.
As David Clark famously put it in the early days of the IETF: "We reject kings, presidents and voting. We believe in rough consensus and running code." It's nice to have working implementations you can kick around and have fight against each other.