What if the Miyako Bay boarding had succeeded?

How might naval doctrine have changed if the Ezo boarding attack at Miyako Bay had succeeded?

It might have revived boarding doctrine for ironclads, encouraged shipboard boarding aids, and enlarged the role of armoured marine contingents, although the argument is explicitly speculative.

The counterfactual asks how a successful boarding at Miyako Bay might have affected navies beyond Japan. Success could have redirected contemporary interest from ramming toward boarding armoured steamships. Designers might have considered ramps or other ways to move attackers between ships, while naval services could have carried much larger marine contingents. The confined spaces aboard warships might also have encouraged specialized armour and boarding shields despite the weight penalty. These outcomes are a speculative butterfly effect rather than a claim about what navies actually adopted.