A few arguments for it being an issue.
- It doesn't make much sense thematically.
- It relies on micro to make happen.
- It relies on unit stupidity for it to work and on player micro to counter it.
- It isn't interesting or clever micro, it's just micro.
- Zero-K game design appears to support removing it on this basis.
Not sure how to do it. Maybe make a nanoframe not exist except for visually (and not on radar) until there is 10-20 metal in it or something. That feels worth shooting and there are few enough units it would matter for. Perhaps make it manually targetable, but have units avoid them and target them last or not at all.
Having them decay quickly if under 20 metal value or something or a percentage could also work well.