You forgot something critical: human imperfection. JWs teach that perfection is only fully restored at the end of the thousand years. So people will be brought back from the dead in their imperfect state with their disabilities and weaknesses and they will be restored to perfection gradually as they continue to obey the new laws revealed in the new scrolls. But the physical building and restoring work will begin immediately after armageddon even while people are still imperfect so until the end of the thousand years there would still be the risk of accidents due to human imperfection that has not yet been eradicated completely. Thus safety equipment would still be needed.
I think the bigger problem is the teaching that human imperfection will be restored gradually after armageddon. This teaching paints Jehovah as an unfair god. The anointed, who proved faithful while enduring the same temptations and trials as those of the "other sheep", get their perfection restored immediately upon their resurrection to heaven, without having to endure a further probationary period to prove their faithfulness while in heaven. But the "other sheep" have to endure a long period of proving their faithfulness all over again in order to be restored gradually. This system is clearly not just. Why wouldn't the other sheep also be restored instantly upon resurrection? It makes no sense. Jehovah of the Jehovah's Witnesses is an unjust, irrational, pharisaic god.