"Beneath the Monolith" was also put out by the same company that produced the original setting with its bespoke system (Numenera/Cypher System). They just know which way the wind blows and strive to maximize their profits.
Multiclassing is an optional rule in D&D5e, not allowing it should not be controversial.
You're right that multiclassing an optional rule, but in practice, I think nearly every player assume it's in use unless the DM says otherwise (and they will likely complain if the DM says otherwise). So I'd bet that if a ruleset basedo n 5e disabled multiclassing, people would either complain about it, or ignore that part and then complain when it breaks the game.
"Beneath the Monolith" was also put out by the same company that produced the original setting with its bespoke system (Numenera/Cypher System). They just know which way the wind blows and strive to maximize their profits.
Multiclassing is an optional rule in D&D5e, not allowing it should not be controversial.
You're right that multiclassing an optional rule, but in practice, I think nearly every player assume it's in use unless the DM says otherwise (and they will likely complain if the DM says otherwise). So I'd bet that if a ruleset basedo n 5e disabled multiclassing, people would either complain about it, or ignore that part and then complain when it breaks the game.