Scope of PI interest / funding defined by research grant.

So, unless research is ground breaking / exploritory across disciplines, supporting disciplines tend to be extremely limited by PI research interest.

aka (wording sanitized a bit) tends to come across as being tight wad / ham fisted

side note: Biological sciences tend to have way to many applicants for available positions. Typically not enough software engineers for available positions.

Treating a position with limited available applicants as if there were to many available applicants is always a receipt for issues.