Because if they can, why haven't they?
LLMs are great and will get better but we have not seen an open source office suite built by LLMs come online yet, and even if there was one I'm pretty sure few would adopt it, cause that's not the only moat, LibreOffice has been around for decades.
Have you not seen WordCraft[0] or EffectCraft[1]?
Sure they didn't build it from scratch but what I'm saying is that there's no moats anymore. If you build something, they will tear it down to its composite pieces and assimilate it.
[0] https://getartcraft.com/apps/wordcraft
[1] https://getartcraft.com/apps/effectcraft
I did, but I also saw this, you can scroll down to the video if it's too long to read
https://www.shokunin.studio/blog/2026/10/9/attack-of-the-vib...
To be honest, their insistence to port this to Rust is likely the culprit of the performance issues.
Let's say there was a 1:1 decomp instead, bit-by-bit exact. This is doable today - what then?
Well, in the case of Microsoft software I'd assume it's because Microsoft owns significant stakes in both OpenAI and Anthropic.