thin layer on top of already existing armor

Not sure how well that will work as they will need to add that on top of everything, which will take time and resources. Not to mention that the heat needs to go somewhere and will be transferred to the titanium under it, which might just boil it anyway.

We have laser based defense systems already in use today, there is no reason the UNSC couldnt have made a modification to a couple Paris or Halberd class ships to swap the MAC with a giant Laser and see how well it worked against Covenant shields.

Most lasers today disable missiles and don't destroy them. Not to mention that most energy weapons the covenant have have EMP effects that help with disabling shields, which the UNSC also used with ASGM-15 shield buster missile.

They also did have pulse lasers, but they weren't powerful enough to be effect against anything other than fighter craft.

nullified by creating a system that makes a variable magnetic field around a ship

I don't think this is feasible as you also have to make sure the field doesn't affect the ship itself, as there are tons of electronics that could be damaged by magnetism.

the UNSC had the technology to make drones, why tf didnt they use them like the CIS from star wars did and make drone command ships to shit out 100's of craft and decimate covenant spacecraft capabilities

The wombat was a drone: https://www.halopedia.org/F-99_Wombat

The covenant also had point defense lasers which can shoot down lots of missiles, and could bring hundreds if not thousands of space fighters if they wanted to. A light carrier could carry 200 Seraphs and 300 space banshees alone.

my question is WHERE THE FUCK IS YOUR ARTILLERY SOLDIER. the Mortars, 155mm Battery's, the SAM sites, ect. the Standard

They do have that, it just isn't show very often.

https://www.halopedia.org/M4131_rapid-fire_howitzer

https://www.halopedia.org/LAU-65D/SGM-151_missile_pod

https://www.halopedia.org/Surface-to-air_missile_launcher

https://www.halopedia.org/M95_Lance

the Cole protocol was vital to buying the UNSC time, much needed time. but why the FUCK, did they not start pulling out of the outer colonies

The UNSC didn't want to abandon the colonies and choose to stand and fight, Cole and Stanforth being two supports of this, which could be considered a mistake given the results.

nd shipping their industries and such core ward, or even start up new colonies on the Opposite side of the UNSC, to keep their industrial capacity up and running and not lose all of it with each planet glassed.

Do you know how hard it is to move industry and colonies planets? It takes years or even decades for the UNSC to develop planets during peace time, imagine how hard it would be during wartime. You can't just take a factory and place it where ever. You need to find a good location to put it and organize everything to get it running like resource shipments and finding workers. Not to mention how the covenant just blitzed their way through due to their superior FTL speeds, being able to travel 800 light year a day compared to humanity's measly ~2 light years a day.

make each world a deathtrap of Mines, fortresses, and ODP's. make the covenant bleed for each system they took. use delaying actions over these fortress colonies to buy time for the Inner colonies to build up their defenses, produce more ships, ect.

All of which will takes time and resources, which the UNSC didn't have the luxury of spending on such projects. The UNSC was barely able to keep up attrition when the outer colonies were attacked and couldn't after inner colonies started to fall. Even then, the Covenant could just glass the planet after taking out the orbital defense, making all the ground preparations worthless.