I have been working remotely for past few month - it is the most difficult thing in my entire career.
The point you have mentioned it very valid - one should be properly dressed before the meeting and before the work - because it adds to your performance
I have noticed that when I work in my night suite I m more lazy but if I shower and change my dress - I am. more active.
I suppose that it depends on your preferences, personally I find not having to commute or dressing up to be very refreshing, as I can perform my job very well regardless of what I'm wearing when I am working, but I can understand why some people may not like this and could prefer to dress up and follow the same routine they have followed for years on their regular job, even if it isn't absolutely necessary since they are working from home.