Even without zooming in on any beast unit in particular, the simple fact that they are part of the Fire Emblem universe is good enough a reason to add them in Heroes.
Now, gameplay-wise, they could also have new innate mechanics, like dragons have (the adaptative damage specifically). For instance, many beast units' combat abilities were "berserker"-like, becoming more powerful the lower health they had. This would bring in something new to Heroes, if these units come with the appropriate (new?) skills.
For my part, I don't particularly care about beast units, but I think they ought to be added at some point.
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