Heyho,
yesterday i finally reached lvl 100 in fishing and wanted to give some feedback from my perspective.
First of all : it's fishing. I know not all people like the way fishing works but i liked it. It's pretty simple but later on you kinda just spam your fishing rod because of the speed bonusses you get. The xp you get seems kind of low but the increasing speed is a good compensation to that. It's feels like getting half xp but double the fishing speed.
Also the luck based drop is kind of frustrating. For example: getting your first gold fish at lvl 48 like me
I guess it was just bad luck but still.
Also the fishes have weird sizes. It looks like the size and the weight define how much gold the fish is worth. But thats the reason why the sizes look so weird often. A 6,8 metre shark weighs 25 kg for example(??). The right size would improve the gold value too much ofc - but it looks very weird.
Cards: the card drop rate feels kind of low but afaik it scales with luck chance and you get more of it the higher level you are (because of bufffood, golden rods, upper body). On the last levels i had way more cards then before (1 card before 50 and like 3 or 4 from 70-100). Also its very nice that they drop with 5 stars already 
but they all look the same 
Content: i was hoping for a few more recipes after lvl 40 because thats where you only get a better upper body every 20 levels and thats it (besides the better baits at lvl 58 from the npc trade). It feels a bit boring to not getting something new after level 60. But the bonuses of the gear itself are enough to make it to 100 in a reasonable time.
Also the cooking/alch recipes drop now way more often then before. 90% of them are like the already existing bufffood and share a cd with them. You just have to fish for the materials. Most of them are not worth using 
(on the other hand if they wouldnt share a cd it would be kinda op too).
The golden boxes are a pretty nice addition for the loot. Most of it looks like worldboss loot which contains alot of crap but also some really useful items (with a low drop rate ofc).
Gold: It was a pretty good gold farm at the beginning but it changed alot since then. Golden fish were nerfed to 10kk from 50kk so it wasnt that worth to trade them in anymore. Also the drop rate of big fishes was hard nerfed it feels a bit unrewarding to use the harpoon now. Lowering the amount of gold of the sunfish would've been better or the general gold of selling big fishes if the generated gold was the problem.
Farming gold in lvl 98 instance should give more gold but no extra loot or cards like you can get from fishing.
Bug?: The gold values vary alot from different factors.
1. Most big fishes have a lower gold value in low level zones. A sunfish you caught on the elven island is worth like 750k gold and when you teleport to syrbal pass the exact same fish is 2,9kk.
https://gyazo.com/947722c6cf81801783a1024415bf0bb3
above is elfen island, the ones below are from syrbal pass
Edit: It is intended. I learned that fishes caught in their "main" or "home" zone are worth less gold inside that zone. Outside of the 2 Zones mentioned on each fish they are worth more 
2. The fishing npc takes all of your fishing loot at once for gold. But for a lower price! more expensive fishes get like 80% of their value if you trade them in instead of selling it to an npc.
https://gyazo.com/6a15999155f4ac2facf43efc045a7a78 Sunfish
Lower priced fish (i dont checked every fish but the Catfish for example) are priced higher. i had one which was worth 40k at the normal npc and the fishing npc gave me 130k for it. Also its worth even more when you go to a low level zone and trade it to the vendor.
https://gyazo.com/75799d02d4e1471520e3f9b907785279 on the left in syrbal at the fishing npc, on the right the normal vendor value and in the middle the elven island vendor price
Edit: This normal because of the mentioned edit before. Except for the selling all part of the fishing npc
I dont know if it is intended but i personally lost alot of gold because of that. 
kind regards,
Persil
