Not certain which two things you're referring to by former/latter:

"solve [data privacy] before [solving accessibility of LLM-based therapy tools]": I agree - the former seems a more pressing issue and should be addressed with strong data protection regulation. We shouldn't allow therapy chatbot logs to be accessed by police and used as evidence in a crime.

"solve [accessibility of LLM-based therapy tools] before [such tools existing]": It should be a goal to improve further, but I don't think it makes much sense to prohibit the tools based on this factor when the existing alternative is typically less accessible.

"solve [barriers to LLM-based therapy tools] before [barriers to human therapy]": I don't think blocking progress on the latter would make the former happen any faster. If anything I think these would complement each other, like with a hybrid therapy approach.

"solve [barriers to human therapy] before [barriers to LLM-based therapy tools]": As above I don't think blocking progress on the latter would make the former happen any faster. I also don't think barriers to human therapy are easily solvable, particularly since some of it is psychological (social anxiety, or "not wanting to be a burden").