Obsoleteness IX - Weapons

Using weapons solely for catching a prey to feed oneself is most probably gone into obsolescence for quite some part of the world even though it would be better to stay this way. But no, humans like development even in the arena of weapons. The impression is that the more devastating it is the better they find it and the more their imagination excels. It doesn't seem to matter how the surrounding and the fellow creatures, including humans, look afterwards. Not so long ago, I read a presentation titled “Future Strategic Issues/Future Warfare [circa 2025]” which stated that classical weapons for conventional war will be obsolete in 21st century and listed a vast array of possible new weapons. The metallic armory has become too expensive. It's a pity all weaponry - present and future - doesn't fit into this category.  It might all develop into digital-nano-robot-laser-frequencies (a nonfinal list).  For instance, an unmanned drone might fly over some high infrastructure building and emit an electromagnetic pulse towards it and all the electronics will be fried; this could also affect people with pace makers or neural laces or similar type of implants. Quite some countries already developed this type of weapon. As unbelievable as it reads, the Spacecast Study 2020 lists as one of the weapons a holographic projector which will project holographic images onto the ground, onto the ocean or onto the sky. Or, some satellite might just direct energy towards some region and dry it into desert like landscape, or some precision artificial lighting accomplished by the use of a laser, or the use of a laser to cut the ozone hole above the adversary (it seems to come with this New Digital Quantum World Order). There was a video on Super-Secret Advanced Antigravity Technology that you won't believe it exists, but the video disappeared, only the text remained. However, you might look up terms like black manta (not the fish), or flying submarine to name a few. Oh, even the nano-mesh that can cloak an aircraft to make it invisible was invented. The question is though, why all this carnage when they already have the technology that can put us all out of existence by frequency modification or at least into long hibernation. Another question is what will go obsolete first, humans & other living beings or weapons & wars?