Armor upgrades do not need to "go", as they are the main thing that permits a fighter to survive capship fire...oh, and MRs would be 1-shotting everything without them...
However, the points still stand that 1) upgrades mk 1, 2, 3, 4, etc, up to 6 or 7 are simply a waste of space...no one who needs them uses them. Armor only has a bearing in PvP, and, by the time you have a PvP viable ship (level 40+) you will likely have a mk 7 or 8 upgrade.
And 2) 15 mill for an essential piece of gear, as commonplace and necessary as an Enhanced Thruster or an Enhanced CM dropper seems a tad over the top. If the intent is that a fully kitted VHF should cost 20 mill+ change, simply up the price tags on top end fighters by 15 mill and include the armor upgrade as standard...it makes little RP sense to slap on an upgrade costing 8 times the ship's price...wasn't this the very same line of reasoning against GBs mounting cap mk 8s?...