Feature description:

Simple upgrade crafting recipes for the gates and cells. Here are the recipes I like to use in my packs (kjs) for that purpose.

Gate Basic to Hardened:

event.shapeless('powah:ender_gate_hardened', ['powah:ender_gate_basic', 'powah:energy_cable_hardened', 'minecraft:obsidian'])

Ender Cell Basic to Hardened:

event.shaped('powah:ender_cell_hardened', [
  '   ',
  'GCG',
  '   '
], {
  C: 'powah:ender_cell_basic',
  G: 'powah:steel_energized'
})

Why you think this feature should be added:

As to why, it cuts down on clutter. Especially lower tiers would benefit from an upgrade path.