VCs care that an early stage team will be able to execute, and to a lesser extent be able to innovate. Telling them that you use a 20 year old tech stack that

VCs care that an early stage team will be able to execute, and to a lesser extent be able to innovate. Telling them that you use a 20 year old tech stack that few junior (aka cheap) engineer's know or want to know doesn't inspire this confidence. You would get a similar read from VCs if you said that you use Haskell, Erlang, or up until quite recently - Rust. There is something pretty comforting to an early stage investor of "We use Java microservices on mainstream cloud provider". Says that the team isn't ancient, isn't avant guard, and that they will be able to hire people. Worst case, an acquirer won't mind buying the leftovers or acquisition hiring the team.