I'd like to see Walkrants (and the Swarmlord) escorted by Tyrant Guard become more viable. They're cool models but it's such a huge chunk of points to field right and the impact these units have doesn't justify that now. Why sink 300-400pts into a T6 bullet magnet when that also buys you multiple Broodlords/Primes that fulfill a similar role, but can't be targeted at all as they advance?
Flyrants shouldn't need gimmicky snap shot rules or
CHARACTER protection as many Nid players keep insisting. Just let them use Gargoyles for protection in a similar way to Tyrant Guard.
Carnifexes need more anti-armour capability. Other Dreadnought equivalents don't suffer the -1 to hit Crushing Claws do, and often get a higher
AP/damage output too.
HT/Fex ranged weapons in general need looking at. Unlike basically every other twin-linked weapon, the number of shots for large Deathspitters/Devourers remained the same. Heavy Bio-cannons aren't worth buying a whole creature for when they can only carry one.
Tyrannofexes on par with the new Leman Russ rules; points drop, Grinding Advance to move then fire twice and some way to make their hits more reliable via Hive Fleet traits, character auras or psychic powers.
The Haruspex is OK, but way overcosted. Around 200pts please.
Medium bugs in general need a bit extra oomph:
Warriors could use more mobility; either via 7" move and/or letting Primes join them in deep strike deployments. I'm not sure why Tyranids are the only race unable to bring along characters in their transport.
Zoanthropes are a bit meh too. The only benefit for taking a full unit right now is ablative wounds so more granularity is needed; such as each model generating additional mortal wounds via Smite.
Venomthropes are too easily picked off compared to the Malanthrope. I don't think they should be a
CHARACTER, but perhaps requiring snap shots on them from a certain distance is the answer?
Lictors on the other hand could be a nice candidate to become a
CHARACTER...
Pyrovores are useless without a Tyrannocyte, and expensive with one. Meh.
More than anything, I want to see fluffy & thematic armywide special rules akin to the original Tyranid supplements in the 90's:
Monsters that fight on through horrific injuries (ignoring damage table effects) Tactical regeneration via stratagems / psychic powers Respawning gaunts like the old Without Number rule Outflank-like stratagems that make an opposing army feel surrounded and outnumberedVirus Outbreak. Enough said.