The net effect of CC3+ is that they score a hit on Inf, AV and WE on a 3+ when in base to base, whether that is using Chainswords, Bolt Pistols or Melta Bombs is irrelevant in game terms.
(though there are indeed people out here who´d live to follow 40k to the latter and represent everything with +1 Extra Attack (whatever))
Do the Tau need TK?
No.
There are plenty of armies that have to work around large WEs, so not being able to shoot up a Warlord-class machine is not game breaking.
Should the Tau have some TK?
Yes.
They are supposed to be shooty and high-tech. The fluff-sages point us to the AX-1-0, which, in conjunction with massed AT, should be able to take out Reaver-Class targets and break if not destroy a Warlord.
While aircraft can indeed be countered, so can everything else, that´s what´s wargaming is all about in a nutshell.
I´d hate to see foolproofed systems like the pre-reform Deathstrikes and Vultures ever again.
The Manta, through sheer size, modelly loveliness and its BFG ancestry deserves TK as well, but currently its massive firepower detracts from the transport role. IMO it should barely be Reaver-level in its output, and cost less then.
I view the "Bomber" suggestions as unworkable, with 45cm ranges it could stay out of the worst flak and shrug of the rest.
As to the Moray, well, APU, repricing and downgunning fixes its stats, whether the Tau should have a flying Shadowsword in the first place I´m not sure.
I´d prefer dependency on combined arms and non-perfect tools, everyone else is expected to deal with difficulties after all!

_________________
Visit
www.epic-battles.de the ultimate german epic site&forum!