Well it just goes to show how they can't please all the people all the time. LEGO games must sell well or they wouldn't do so many. Lots of people like them even though I can understand having the wishes/preferences you do. I am somebody who was just thrilled to see Feral begin bringing games to iOS and even though I knew I wouldn't have time for it yet, I bought Rome:Total War when it released for iOS because I also knew I wanted to play it on my iPad and given that, buying it on release was my very small way of supporting them coming to iOS. I have since played it some but not seriously yet. I love what I have seen so far. They did an awesome job with the touch controls in my opinion. They did an awesome job period, as usual.
I wouldn't assume that branching out into other areas such as iOS ports necessarily means cutting back elsewhere. That assumes a lot that might or might not be true. One thing I would say is for sure is that if the iOS games sell well, what's good for Feral is probably also good for the Mac side of things in a general sense.
I'd agree with you that iOS has too many games. However, I would argue that iOS could certainly use more high quality games that come in one piece without microtransactions poisoning their designs and other issues relating to poor quality. So from my perspective I think it is fantastic to see Feral bringing games to iOS and look forward to upcoming releases as yet unknown.