I don't understand the point of your comment. Are you saying that because Signal solved a problem in one way it should be immune from future criticism? This seems like a really narrow perspective, the opposite of the kind of curiosity and creativity this site tries to foster.
I think it's good to take a look at Signal, recognize that it's better than what came before, and still come to the conclusion that it could be better. Signal is far from perfect despite its achievements, and today, years down the line from its original success, there is much room for improvement (or, barring that, replacement).
I think it's good to take a look at Signal, recognize that it's better than what came before, and still come to the conclusion that it could be better. Signal is far from perfect despite its achievements, and today, years down the line from its original success, there is much room for improvement (or, barring that, replacement).