I don't think it was a particularly good tactic, but if there was some motivation, it may have been more about political sabotage than foreign adversaries. I think that is the more interesting conversation, personally. What do you do if your political (domestic) antagonists control your comms? This question applies to all sides politically. Signal itself is promoted for "activist" use cases to protect comms from domestic antagonists. I'm presenting a similar dilemma. If one part of the government, (e.g., the military) controls secure comms, then another (e.g., the political) may have no choice but to opt-out. This problem is maybe better seen in the context of another country. It may be "too close" for us to see it clearly in the U.S. Other countries face this problem all the time, and Signal is used for the same reasons. I find it an interesting security problem.