It doesn’t have to be, but it might be.
I don’t think many people will make the effort of backtracking every time they realize that one sentence ended and another one started several words back.
The effort it would take you to put a full stop (.) at the end of each sentence is much less than the cumulative effort of every reader having to go back and reread what they just read several times per post.
So if you’re not willing to put in that small effort, you might find out that very few other people will bother to accommodate you and it might end up being a waste of time trying to use these forums.
It’s your choice. Good luck. 
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