Before we get into the changes that Twitter has made to its iOS and Android apps, it’s important to consider just how many people actually use the official Twitter experience over third party providers like HootSuite and others. I found some ancient statistics (over a year old) which claim 42% of Twitter users used unofficial apps but that was not looking at mobile solely. Reliable statistics in these areas can be hard to come by for sure.
With mobile use exclusively this kind of data is even harder to track down. Regardless of who is using what though, it’s likely that Twitter is more interested in everyone using native Twitter mobile apps moving forward which further indicates their march to limit third party development around the platform. If the latest tweaks to the mobile experience are any indicator then that is a fair guess.