Not sure what Ragnarok is refering to ? Maybe a problem of the past ?

My hotbar doesnt change on Laezel, who is my current Eldritch Knight Thrower.

Karlach as Monk is pretty powerful, but Monk as a class is too rest dependent, and I prefer to never use Soul Coins - there are only 19 in the game anyway, so its a very finite resource.

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Shadowbart: Throwers are of course warriors who throw.

All Thrower builds use of course Tavern Brawler and its a good pick for using Elixiers of Giant Strength, too.

Eldritch Knight can throw their bound weapon and its automatically returning, so thats a natural choice. Since you get TWO instead of one extra attacks on Fighter 11, most people play this class pure or take just a single level of Rogue for Expertise in Athletics.

Open Hand Monks will take Tavern Brawler naturally anyway, since it boosts their damage and the reliability of their damage to silly levels, so thats too a natural choice, but unless they have a returning weapon, they will have to carry big heaps of weapons with the throw property. Typically one will play Open Hand Monk 9 / Thief 3 for the extra offhand.

Finally there is Berserker. Berserker 5 / Thief 3 / Some Fighter 4 is the typical build. I would probably go for Eldritch Knight again, so any weapon can be made returning AND one can Disguise Self into Dwarf for using the Dwarf Thrower. Of course some people have this ugly helmet to Disguise Self and dont have to pick up EK for that.