Romulans have been given practically every advantage in cloaking space combat, ground combat and their ships make the KDF vessels obsolete.
Cloak: They were given our B'rel enhanced battle cloak. They have battle cloaks on most of their escort types. Their captain racial and optional traits include SIGNIFICANT bonuses to cloak timers and damage/duration.
Ground: self explanatory. Just look at what they get.
Ships: All romulan ships have 'tier 6' type design. You simply cannot compare the performance of an = tier KDF and romulan ship.. its a gap in performance as vast there is between a Fed Nebula and Fed Vesta.
If that wasn't enough, we see the talshiar lockbox ships are literally making every tier 5 kdf ship obsolete when it comes to cruisers and escorts.
Our consoles will be available to romulans through the cross-faction consoles too.
So, really.. why would people bother joining the KDF these days? With the history of zero unique ships being made for KDF in the past 2+ years and the bulk of the kdf fleet being old releases and romulan ships having the 'tier 6' design at end game... well... you would only join KDF for the bloodwine.
Cloak - Makes perfect sense that the Romulans are superior in this area, they invented the $##$@ thing.
Ground Combat - My Gorn is still melee wrecking ball today that he was last week, nothing the Romulans get is changing that.
Ships - Not sure what you mean by "All Romulan ships are Tier 6 design". My starter Rommie BOP is definitely not anything other than Tier 1. Also, you conveniently forgot to mention the power level disadvantage all Rommie ships must live with.
Tal Shiar lockbox ships - Are flyable by all factions, so go get one and drive it around with your KDF character.
Consoles - Yep. And it's only a matter of time until Cryptic starts cramming some of the Romulan-specific consoles into a future lockbox.
Why play KDF? Because you get to be Klingon, Gorn or Orion etc. Sure Cryptic didn't give them a great deal of scope for gameplay and they got provided with a limited amount of ships compared to Fed players but seriously Klingon ships are awesome, well I think so. I always loved the designs. Even the starting player Bird of Prey is a great ship, far more fun than that awful Miranda the Feds get.
Maybe now with the new Klingon start at level 1 theres even more incentive to be Klingon. Of course if you don't like Klingons don't roll a character, nonones twisting your arm. Go and be a pointy eared Romulan hobo if you want. KDF is for people who like the race, the ships and enjoy battles, song and bloodwine.
Oh and the Klingon ship computer is far cooler and more ruthless sounding, "Targets shields have failed", yeah seriously awesome and better than listening to Majel Barrett whining in your ears every 10 seconds if you're playing a Fed.