Is it able to determine the end of sentences correctly all the time? If not, there needs to be some means for humans to indicate the same, and typing two space

Is it able to determine the end of sentences correctly all the time? If not, there needs to be some means for humans to indicate the same, and typing two spaces is a reasonable one. I disable even autocapitalization wherever allowed as the systems just don't get it right. Instead of me trying to learn to correct when the system would get it wrong, I rather find it easier to just habitually do it correct by myself.