I am not calling people to disobey Christ, but you have a right to your opinion.
You are saying "
There are many reasons against trying to enforce church discipline." So that sounds to me like Jesus saying do church discipline and you are saying there are good reasons not to do church discipline.
None of these things involve public sins that would embarrass the church or adversely affect its testimony.
Actually, they could very much.
Lack of attendance -- You have someone who claims to be a member, but never shows up. That is embarrassing to the church. It sends the message that the gospel doesn't change lives. When someone fails to attend church, they are openly disobedient to a clear command of Scripture involving attendance and ministry to others. The idea that once someone joins they are on the roll until they die is not biblical. When someone stops coming, they are removed from the roll under church discipline.
Questioning the pastor's decisions -- The pastor decides to preach doctrine, and someone questions, and then spreads it through the community. That is a serious matter.
I don't know anyone who disciplines over unsolicited suggestions or not singing. Quite frankly, that sounds absurd. You are reaching for the farthest most silly thing under the guise of reasons not to do what Christ said to do.
An emphasis on church discipline could lead to disciplining members for differences of opinion, different personalities, different preferences, etc. I was addressing these dangers in church discipline, not sins that would reflect badly on the church.
First, again that's pretty silly. If that's the best you can do as reasons not to practice church discipline, then that's pretty weak. But as a Baptist, the church body decides on church discipline. If the body is unconvinced, then they don't vote affirmative. It's pretty simple, and it prevents abuse.
So if your point is that a church should be careful in practicing church discipline, then you should say that. You should not say there are good reasons against it, because that is contrary to Scripture. The fact that a church wrongly practices discipline is not a good reason against church discipline.