This is not about socionics imo. If a person likes other person's input or/and into the subject that is talked about, then ofcourse they can enjoy long explanation.
The tricky part in this situation is that you don't know if person is into what you are saying or not, if they are not, they can be like oohh gee am I gonna read all of this, on outside they can be like oh cool thanks a lot. Besides, maybe that person was into one aspect you didnt mention it and your whole text is about something else etc.
I can form long sentences irl
but I cannot remember sending a long text out of to blue to someone. But when we are texting back and forth in real time, I might do it, but then I hit enter so it is not like wall of text most of the time. For me, this is better because you can gauge if you and other person is on the same page.
No friend of mine send me wall of text out of blue as well, this only happened if something bad or tricky happened between us, I only received it if other person was into me, so in my case, me liking or not was generally about what has been said and my level of interest. Though generally speaking I dont like wall of texts, back and forth is better.