I observe the day for the sake of worship, I don't worship for the sake of the day. The former is honoring the Sabbath, the latter is legalism, and was the point Paul was making in the Romans passage you posted. That the ceremonial aspects, the dietary restrictions, days of fasting, etc. are no longer relevant does not mean that the Lord's Day is negated.
Again, my points from the article - you may continue to object to them, which will cause me to either repeat myself, or eventually ignore you. Since you didn't object to my previous rebuttal on what constitutes pajamas, play clothes, and dress clothes (which I can't even believe I'm having to define to another adult) I'll assume you're ok with the definitions:
Point 1) There used to exist a general sense of decency and decorum - especially on the Lord's day, but generally in public. This overall standard has been watered down over the last several decades, but seems to be increasing. An overall lack of formality and lack of discernment as to what is proper and what isn't.
Point 2) People who refuse to go to church unless they can dress casually - the issue is with them, and not with the church. The issue is their personal comfort taking precedence over service to the Lord. It makes their faithful worship to Him conditional, and that's just wrong.
I simply do not believe that to be true in every case. I am a casual dresser when it comes to church meaning I wear slacks most of the time. I do not do this because I place my own comfort over revering and worshipping God. It's what I have. Frankly, I own very few dresses or skirts and I do not intend on buying any. If I am ever turned away from my or any house of worship for wearing slacks, I will no longer attend that particular church.
A house of worship is not a fashion runway and I will not allow my spiritual walk to be hindered by such pettiness.
I left such a legalistic body years ago. This particular church is one of the most affluent churches in our town. All of the ladies at this particular church were well dressed. They wore designer labels, fancy jewelry and drove the finest of cars. So much that it became a competition. The jealousy, backbiting, strife and overall condemnation of others was pathetic. Their clothing was a mask of their spiritual inadequacy. The treasurer, one the best dressed ladies you will ever see, was buying personal items with church funds and sleeping with the pastor who was married. The pastor's wife was addicted to Xanax, as were several other ladies, and was a walking zombie most of the time. You would have never known this by looking at them. Affairs, stealing, lying, gossip...you name it it was going on. On the outside these looked like a bunch of "holy" people. On the inside they were a mess. This particular church is now in such disarray you'd be hard pressed to recognize it as a house of God.
My reason for going to church is to fellowship with my brethren. To be fed spiritually and, as a result of that feeding, to grow spiritually. It is not to make a fashion statement or to convince anyone of my worthiness by wearing the right clothing according to their standards.