The success of the Triumph Acclaim had been noted and Honda's lifecycle meant a new car every five years or so, so it was natural that the Triumph Acclaim would benefit from the new platform.
As it turned out, the new car was bigger then the one it replaced and Honda had deferred to Rover on the interior design. This gave the car a more upmarket feel and as a result it was decided the new car would be a Rover and the Triumph brand would fade away along with the Acclaim.
Initial launch was typical Rover, not all the options were available and there were issues with handling which Rover's chassis engineers quickly fixed, with this being applied also to Honda's cars as well. The car had been a true partnership in terms of development and design, which influenced how the two companies would work together in the future. While the Acclaim was literally a badge engineering exercise, the 213 and 216 had some input from both sides, with Rover being able to design a different grille to differentiate the Rover car from its Honda cousin. The result was a car that sold well, that though was not necessarily the good news that it initially appears.
Yes the 213 and 216 sold well, but this was more often at the expense of sales of the Montego and Maestro, cars that were made to be mass market competitors to Ford and General Motors. This however wasn't happening, and it was the groups own sales being cannibalised by the new car, not the competitors. As good as this car had ended up, the next one had to be better...