Fishing Boat being single use item feels like unnecessary inconvenience that makes it tedious and frustrating to use. The crafting cooldown and one of the reagents being crafted by engineers add further barrier to its usage making fishing as whole less enjoyable.
Whole ordeal of having to commit yourself to first visiting AH to acquire the copper bolts, traveling to good location and then being "forced" to fish for the next 1 hour feels rather tedious. Also the fact that you lose the boat incase you need to briefly exit game or otherwise have client crash is extremely frustrating as you're left without a boat and likely with cooldown remaining before even being able to craft new one.
I wouldnt mind the survival crafted Fishing boat being single use item either if there was another option that was reusable. Perhaps NPC that would sell you reusable toy that deploys fishing boat similar to Goblin Brainwashing Device.