The most practical constraint is getting to one. The paper indicates they will "resemble intermediate mass charged black holes". The nearest black hole at the

The most practical constraint is getting to one. The paper indicates they will "resemble intermediate mass charged black holes". The nearest black hole at the moment, maybe a worm hole candidate, is V723 Monocerotis at 1500 LY away. This would be tens of thousands of years of travel. So perhaps we can learn from afar but not visit.