FWIW, it looks pretty superficial at?this point with what seemed to me like about 33% features of the smallish mobile app at best, and although there is a lot in its pipeline according to IBKR website, I wonder if it's just going to be an eye-candied and simplified alternative to TWS for the non-PRO users. And honestly I'd be flabbergasted if they?ditched all the work that has gone into TWS+API for no?apparent?benefit. Besides, it's still Java and this could mean the underlying data protocols are carried over from TWS (likely spanning the mobile app as well), suggesting almost trivial migration of the API capability. I don't see this as a potential breaking change so far.

Still, the concern you raised resonates, so I sent a consonant inquiry to the feedback?email address that they provided - let's see what they?say.

IBKR Desktop does not act as an API server, so it is by default out of the scope of this "TWS API" group I would think.

But I have looked at IBKR Desktop and it is in my opinion not for the serious investor or trader (which is traditionally the IBKR client base). It seems IBKR's attempt to have a more 'user-friendly modern looking' desktop client to better compete with retail brokerages (Robin Hood, TastyTrade etc) but a lot of functionality that is present in TWS is lacking.?
For instance there is no Portfolio Risk tool as in TWS (an absolute must in my opinion if you trade anything short) and no ability to do What-ifs to evaluate eg impact on margin for new positions. The fact that IBKR Desktop also does not support Advisor-type accounts at this time is also an inkling it is not targeted to any 'professional' user.
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My opinion is that IBKR should have focused on bringing TWS in a modern UI (there are quite a few UI quirks in TWS) and introduce a Beginner mode to make it easier to use for novices, rather than starting from scratch the development of a new desktop client. They now have TWS, IOS-Mobile app, IBKR Desktop and their website that all look and feel different.?