But it is important that weapons fit in the culture that uses them.
For example, why did vikings not use curved weapons? Because they are not suited to close quarters combat, or even dismounted combat in general, this then informs many further aspects of norse culture, their armor designs were made to withstand the hacking of axes and stabbing of spears and swords, it also in turn influenced their mythology, the warrior spirit and culture they so famously had, even down to their jewelry, hammers were a popular motif in norse architecture and jewelry.
While there is nothing objectively wrong with saying "this is fantasy so lets put cool looking stuff in it" it detracts from the overall authenticity of the universe.
One game that handled this well was Skyrim, you can tell by looking at a weapon who made it, what it is used for, and where it came from. A long and straight 2h sword is likely of Nordic origins, a curved scimitar is wielded by the Alik'r, a katana is the weapon of the Akaviri and their descendants the Blades, if something looks roman its probably Imperial.
Its getting these cultural notes, that weaponry is a part of, right that help build a fantastic world that is immersive and believable
becouse theyre biggest enemy wasnt armour(arabians, slavs) but shields(well most of them used metal blades attached to theyre gauntlet to kill someone, by hitting wim with up to five blades in his belly, when you are blocking his attack, vikings started to use shields when they invaded Britain), and you can not penetrate shield with sabre
do you think katana, sabre, long knife, scimitar is primarily throwing weapon or what did you meant with that?
horses are very rare in northern regions, even today and becouse there were no horses they didnt knew what horses are good for, even romans didnt knew horses they got them after they started to trade with nations on arabian peninsula
when greeks first saw men riding horse(they probably rided elks in that time) they though its one being, becouse they never saw them when they get off the horse(elk)
Alexander the great rided horse that was only about half metre bigger than donkey, so no big horses like in those movies
, so if norse wanted to ride horse he had to bring one with him from europe
first,no leather armor can withstand stike with heavy double bladed axe, or even theyre heavy sword
or do you think that if it can do this to shield

it can not do anything to armor?
second,norses used spears very rarely
just ahh...
they used hammer becouse it was Thors mightiest weapon and all warriors prayed to Thor more than to Odin, if they werent from Loki cult, they used brain in combat instead of muscles,they use only one-edged swords, they relied on swift moves
F=m*a a= acceleration a=v/t v=velocity(speed) t=time => E= 1/2 mv2
so as you can see swift blows are more efficient than weight of sword so they used tactics like if theyre were fighting with katana plus dirty fighting and fact that they traded with Varangians(Varangians prayed to Slav gods and are genetically Slavs, so they didnt had problem with them as other Skandinavians), so they didnt have to steal from anyone