For me, Skype is primarily associated with voice communication, and I'm very grateful for that; it's an amazing thing. Otherwise, I would only be making money from phone calls to Penza.
And I find it more convenient to chat in ICQ; sometimes I communicate with 4-5 people at the same time, which would be difficult to imagine in Skype. Although, again, if the conversation is on one topic, then a conference in Skype is a great thing. However, since I have 30 times more people in ICQ than in Skype, it's not possible to switch to it completely, and there's no need to, it's convenient as it is. Regarding crashes, Skype has crashed twice in my experience, but I don't remember ICQ crashing, maybe I wasn't around.
Oleg, please correct "ICQ/Skype" in the table header. It's a small thing. Those who want to play will figure it out.