You got the point but it would be better to have their own app but as said it wont really be that simple and it would takes time.
You've just said about mobile version which is already available on most gambling sites nowadays and yes, its quite hassle to have that
entire full webpage scrolling and zooming in and out. Mintdice team is surely making up some progress on making this site way more better.
Mobile web is coming first, and then development from there can progress into an app relatively easily. So that's definitely possible, but that would be a while longer. The mobile web design that is coming out should be quite good though.
Mobile app is something really liked by the people and wanted and requested as we can see here but I feel like it could never be as much used as website itself. Website is always the most used one and I prefer it that way since it is easier to play on the website. People are forgetting that not everyone have those huge Samsung or big new Iphones, I have a very old phone and even tho I can download the app and play there the screen is too small and I have fat fingers

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It is still something requested and there should be one just because to service those who want it but it won't suddenly change the user numbers, it won't be something like "oh we have 50 active users on average and with app we became 100" type of deal, it would be more like 50 to 60 at most if you ask me.