Martials don't even get anything from a 5th level multiclass into another martial class
(ttrpg.network)
Martial hybrids are fun and good in other systems. In D&D 3e, for example, its the complete opposite situation; martials can pick up cool tricks like dual wielding while progressing their accuracy and health, whereas casters lose a level of spell progression and gain a second track of spell progression thats about as strong as a lv 1 character