These chapters deal with how to handle differences of opinion among saints as to what is permissible to do and what is not. I have even written an exposition on Romans 14. The issue of standards must be decided based on passages such as the two I just named, and the Biblical concept of ministerial authority. It is a difficult topic and one that is worth wrestling over. In regards to personal holiness, yes, we all need personal holiness.
Holiness refers to separation.
The Biblical concept of holiness is first and foremost a separation unto God, and then secondly a separation from the world system that is opposed to God. That is the nature of holiness. When referring to God's holiness, the Scripture is referring to His separateness from the created realm. The concept of holiness does bleed over into the idea of morality, but it is not the primary referent. This question will be better answered after examining I Corinthians 8-10, and Romans 14.