Greetings again Sethproton,
Possibly I have not properly considered the full teaching of 1 John 3:1-3, but I suggest that even though they had encountered Jesus after his resurrection, the full implication of what that will be like for us is yet to be experienced. We will be changed and will be given some powers, of perception and other things. I believe that 1 John 3:1-3 will involve more than physical appearance, but aspects of the mind. I believe that Jesus was immortal during the 40 days, but he was able to withhold the physical glory that Jesus revealed to Paul when Paul was on the way to Damascus.
One of the problems with a thread like this, is that the participants have many other teachings that they believe. We have a SDA, a JW, and I am a Christadelphian, and these three do not believe in immortal souls going to heaven at death. But even here the SDAs and JWs do believe something similar, that the SDAs will go to heaven when Jesus returns, possibly leaving their body behind, or it is dissolved. Similarly with the JWs, they believe something similar with Jesus and the 144,000, while the rest of the JWs will be resurrected and live on the earth. Christadelphians and myself believe that they will be resurrected, firstly in their mortal body, and if found faithful at the Judgement, our body will be changed to immortality, not replaced. We do not believe that we go to heaven, but believe that we will be upon the earth and interacting with the mortal nation of Israel and the mortal nations. As such they need a body, even if equivalent to the body revealed when angels appeared.
Perhaps one question, what is the difference between your view, and the common view that man's immortal soul goes to heaven at death? What in reality is the resurrection?
Kind regards
Trevor