1) The funny thing about determinism is how deterministic you should be when to break, its kind of a recursive problem. agents are inherently very tough to guardrail on an action space so big like in CUA. The guys from browser use realized it as well and built workflow-use. Or you could try RL or finetuning per task but is not viable(economically or tech wise) currently.
2) As you know, It's a very client facing/customized solution space You might find this interesting, it reflects my thoughts in the space as well. Tough to scale as a fresh startup unless you really niche down on some specific workflows. https://x.com/erikdunteman/status/1923140514549043413 (he is also building in the deterministic agent space now funnily enough) 3) It actually is annoyingly expensive with Claude if you break caching, which you have to at some point if you feed in every screenshot etc. You mentioned you use multiple models (i guess uitars/omniparser?), but in the comments you said claude?
4) Ultimately the big bet in the RPA space, as again you know, is that the TAM wont shrink a lot due to more and more SAP's, ERP's etc implementing API's. Of course the big money will always be in ancient apps that wont, but then again in that space, uipath and the others have a chokehold. (and their agentic tech is actually surprisingly good when i had a look 3 months ago)
Good luck in any case! I feel like its one of those spaces that we are definitely still a touch too early, but its such a big market that there is plenty of space for a lot of people.