There's no technical reason why the pouch couldn't store any number of equipments, and with the modern Scroll Menu Generator, navigating this wouldn't even be that hard. It might encourage the player to use the pouch as a full inventory, which is not intended, but would be functional. For now, the pouches have simpler not scrolling menus and a limit of 3. But with headers and footers, the compare screen should perform well if converted.
There's no technical reason why the pouch couldn't store any number of equipments, and with the modern Scroll Menu Generator, navigating this wouldn't even be that hard. It might encourage the player to use the pouch as a full inventory, which is not intended, but would be functional. For now, the pouches have simpler not scrolling menus and a limit of 3. But with headers and footers, the compare screen should perform well if converted.