Engi main since 2013 and i love the weaponkit-playstyle.
I played core power engi during the dungeon meta with 2-4 kits, condi core-engi during HoT-raids with 4 kits.
And i love and play my rifle power holo with 2-3 kits since PoF-beta in fractals(during the power-meta) and all raidwings.
Just to name some builds with multiple kits. ( My pvp/wvw build tend to less kits)
I enjoy the access to so many skills at the same time and the possible combinations kits and the toolbelt provide .
Would i like an updated look of mortar and co. ? YES 100%.