The reason Rev 22:18 is so important is Jesus Himself is telling you not to imagine something else in those verses. Not me. For example under the "Rapture" column there is "Christians taken first others left behind" citing 1 Thess 4:13-18. YET verse 16 clearly says "the dead in Christ shall rise fist". That is the First resurrection which Jesus calls the "First". I love scripture so I don't reject any of those scriptures but I don't see any reason to entertain any notion of a rapture before the dead in Christ are raised.
"16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
17Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord."
Besides that people are injecting the notion that the "church" gets special treatment. The Body of Messiah encompasses ALL who are His and keep his commandments. He wrote those letters to multiple churches telling them to repent with stern warnings. Notice to Philadelphia He commends them for "Keeping His Word".