In terms of exhaust weapons, I wonder if non-exhaust ion, HH12, etc. would make vehicles unplayable.
I mean, losing one action on an ATST is pretty big. Not being able to move and shoot, or pivot and shoot, or aim and shoot, etc. can be crippling. You either have to shoot with no mods, or just move.
As it stands now, you can shoot ion every turn as long as the unit is not suppressed. If you did not have to reload ion, and could shoot every turn suppressed or not, there really would be no counter play as a vehicle, other than take out the ion unit as fast as possible. Or if not suppressed, a unit could continually move and shoot ion, etc.
Or, an HH12 without reload would be a little too good. Wipe out an ATRT in 2 rounds, or just continually throw 3 black dice with surge conversion out to range 4.
Also, I am sure we will see more types of support and heavy in the game, so perhaps ion will be better in the future. Right now there are not that many vehicle options.
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Just some thoughts. That being said, I take DTL over HH12, and likely flame over ion haha.