Hmm, I think this is a pretty good example. 
There are conjugation practice tools out there, but they are often stand-alone and, while very often free, also kinda clunky, IMHO.
A Bunpro-devised conjugation tool could fairly easily have the potential to outshine all of them, and could also potentially be integrated with other existing aspects of the app/site, such as perhaps allowing ‘analysis’ of the conjugations within example sentences (both grammar and vocab) and/or the answers expected within the Clozes.
Anyway, lots of potential there. (Though, also, even a very straightforward and simple version of the tool initially would already be a clear value-added feature, appreciated by many, especially those new to Japanese verbs.)
The point of this reply is not specifically about a conjugation tool, but about supporting the cautions regarding ‘opportunity cost’ and ‘feature creep’ that the OP is trying to emphasize. Maybe a conjugation tool is not the most impactful possibility that could be pursued, but the point is about keeping an eye out for such possibilities, and weighing the potential costs/resources and benefits they represent. Not saying the Bunpro team haven’t already done such an evaluation, just saying it doesn’t hurt to be reminded about it from time to time. 