Yeah I understand that's what he said, "most engineering items are limited" probably means stuff like freeze grenades, rocket boots, reflectors, etc...
I believe in 2.4.3 belt and goggles were still enabled (according to some searching), unless the Warmane devs made a special exception and change to disable them of course.
I think most people definitely would prefer them to be disabled, but it's the devs call to go full-Blizzlike or not, and the players will adapt either way.
I would also like to second the request to disable class stacking in arena.