The productivity wasn't really that good. Rose tinted glasses. All the VB apps I've seen (and still get paid to maintain/rewrite to this day in the finance world) are an order of magnitude simpler than even a simple modern website. They often only have a few users, no devops automation, no deployment automation, terrible logging, terrible instrumentation, no tests, unacceptable access control, tons of failure edge ca…
I was with you until "... so is writing a React frontend". No. No it's not. Making a functional UI in visual basic is childs play compared to the absolute cesspit of NIH and feature treadmill that frontend web development has become. You are gatekeeping with strawmen.
Not sure, but I think VB is still responsible for most of MS’s security threats even now. It makes sense for MS to try to EOL