Hmm I might have to do some more testing but my reports were not only from my own experience, but also that of others. But, not scientific because: since I don't actually want to wait, I was recently only using Electrum with RBF switched off (since they have that toggle in their interface), never on.

Also I am using them only occasionally since as mentioned I don't actually trust them (which to my mind is like a 100x bigger issue than LN support! An ATM which randomly decides to not issue cash is not OK!).

Re: SIMs and so on, good point. Behaviour might change if you are using a foreign number.