Problem is the current visas are fairly vague and ambiguous. B1/B2 visa allows for business travel for things like negotiations, conferences and such. You can't

Problem is the current visas are fairly vague and ambiguous. B1/B2 visa allows for business travel for things like negotiations, conferences and such. You can't "work", but the definition and the practical enforcement of work is nebulous. For instance, here is a category listed by the government explicitly for "Engineer(s) install, service or repair commercial or industrial equipment or machinery sold by a non-U.S. company to a U.S. buyer". Now if someone travels to the US to meet with a team here but also checks email / slack, or write some code together, is that work and in violation of the scope of the visa? If so, what's the alternative? Can't get any actual work visa since those require employment and being paid in the US.