i strongly advise against it. blockstream is a company and centralized companies should never be trusted in bitcoin world. they WILL definitely track and store all your addresses and IP addresses and link them together. and while using an Electrum node you are sending all your addresses to that node so it is an easy task to achieve. if anything i would suggest banning that node or disconnecting from it anyway you can.
random nodes run by individuals has a much lower chance of recording your information.
Allow me to chime in again. Exactly for those reasons I would have discarded it and not even have bothered, but the reason I came here and asked the question was that Thomas Vögtlin himself, the creator of Electrum, is endorsing it. Or so it seems to someone who is not a user of Twitter. I mean, he should know, shouldn't he?
it should not matter one bit. you should always use your own judgement, and that is my judgement of the situation. and it is not just blockstream, any other company specially when they are located in US should be considered risky for your privacy.
random nodes run by individuals has a much lower chance of recording your information.
Individuals can often be easily bribed or otherwise corrupted, vide Mycelium creator who went on to start Chainalysis and sybil-attack the Bitcoin network. Blockstream and the people behind it so far haven't proven themselves to have such inclinations, on the contrary their block explorer provides privacy tips (which by itself may not be much but it at least gives some insight as to what their motivations are).
that is why i said "lower chance".
it is not about the company wanting to do it themselves, it is about how easier it is for the government to put pressure on a company to do what they demand than it is to do it to an individual.
and finally when it is publicly endorsed to connect to a specific server it raises a lot of red flags because it is suspicious and there simply is no reason for you to connect to only one specific server since there is no advantage or anything like that. not to mention that connecting to random nodes distributes the traffic instead of focusing it all on one node.