why dwa don't considering heading diff as a score anymore?

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Hi everyone, I am using dwa for a holomic robot. Since heading towards the global plan is important in my work. In the old trajectory planner, the total score is 0.3*heading diff+goal+target+occ. But in the new dwa planner, it uses alignment cost and goal front instead. Why the new planner uses these 2 factors? And my robot fails to head with the global plan. It looks really ugly in real world! Thanks for your help!