The Elbonian navy as a warning about incompatible fleets

What does the panel mean by an Elbonian navy, and what might one look like after the Napoleonic Wars?

It is a fleet assembled from individually attractive foreign purchases whose incompatible machinery, supply needs, and training systems make the whole force ineffective.

The panel defines an Elbonian navy as a collection of ships that look impressive separately but cannot be supported coherently. Buying capital ships, cruisers, and destroyers from different countries can fracture ammunition supply, maintenance, spare parts, and crew training. The example shows why fleet standardization and logistics can matter as much as paper specifications.