When the fuse wire is bare copper it’s resistance will vary more over time because of oxidation and dirt, which makes the fuse less reliable.
Fuses can only “burn out really violently” when there is a lot of voltage over them. With low voltage fuses the current simply stops as soon as the fuse wire breaks, but with high voltage over the fuse there will be a substantial arc which melts more of the fuse wire before the fuse current stops.
Not too long ago I was looking at some youtube video’s about solar panels and electrical faults and fire hazards. Think for example about a burning house and firefighters want access to the house via the roof. Then how do you treat a damaged solar installation which may have 600V and can deliver 10A continuous?
DC currents are able to generate much longer arcs then AC. With AC the conductive plasma arc extinguishes momentarily at each zero crossing, and it has 100 opportunities to stay out each second.
There are coarses for becoming aware of potential risks and learning how to handle such situations. There are also plenty of tests on youtube which show what kind of sparks such a 600V 10A installation is capable of generating.
In the latest iteration of your board you have Silk screen print over the solder pads. Some manufacturers print the silk screen over the coppper, which makes soldering difficult, while other manufacturers assume you do not want silk screen printed directly on copper and they remove it.
On the side of the fuses you also have an exposed copper strip over the whole length and this gets quite near the fuses. If an arc is generated when a fuse blows, it may arc over to this copper strip.
Almost all copper tracks are 0.5mm wide, but in one corner you have a track of 0.25mm. Did you look at your board with the 3D viewer before ordering them?