While it is an electron app, it’s a pretty decent one. Because it’s not full of tracking and other crap it’s pretty responsive.
Their web and mobile apps are pretty good. Its definitely not as polished as gsuite or office, but it’s still good and you are the customer not the product.
Seems the second group is a vocal minority. This feature helps the first group, but doesn’t help the second group.
According to Signal, the first group is the larger group and this helps the most users of Signal.
Could it be better? Sure. This is still a good step in terms of privacy, even though it doesn’t really improve anonymity.