Hello, I am a final year grad student at UCD and among many of my passions and recently acquired skills molecular biology/simulation is one of them. I have been using ChimeraX for some time now to learn and have used it extensively as well. But with every changing version I find wide gaps between functions.In the recent version 1.11.1 some commonly used functions like icoshedral have been completely removed and syntax changed. I develop applications for fun and utility as well and I understand that change is necessary. But you also have to understand backward compatibility. You simply cannot remove a function and expect people will adapt to it. Please do not remove syntax and backward compatibility. I understand that you may or may not be using AI to improve the application but one thing I found is that AI will hallucinate and will try to make changes or rewrite unnecessary code to prove its superiority which sometimes just removes backward compatibility. I would really appreciate it if you would understand my frustration. Just my two cents. Thank you. Sincerely, *Anindya Karmaker* *______________________________________* *PhD Candidate, Chemical Engineering, UC Davis* *McDonald-Nandi Lab* *Email: **akarmaker@ucdavis.edu <akarmaker@ucdavis.edu>* *Mobile: **+1-530-760-8681, **+880 1776929828* *LinkedIn:* [image: Anindya Karmaker] <https://www.linkedin.com/in/anindya-karmaker-943b66166/>