Ad aspera

30 is roughly the fifth dodge stat for a warrior, not the third. Dwarves don't have hundreds of attacks from one-handed weapons (which also work with shields, can disarm, parry, and do other nasty things) and the same dodge with accuracy. They don't have AoE, paralysis, critical hits, or the HP of two-handed weapons (which can also take parrying). And to use their different abilities, they need to level up different stats, not like two-handed weapons. You're overestimating the pushback with anticipation – if an opponent breaks through, they've broken through, and the dwarves become practically useless. And it won't be difficult for some one-handed shield warrior to break through.