Jabed, with respect, I really have to wonder why you are posting on a site like this. You are clearly not interested in views that challenge your own rather unconventional ideas about schooling.
You ask people what you should be looking for in a school for your son and then accuse people who are taking the time to respond of 'interfering'. Can you see how this is a rather strange position to take?
You also say 'I really don?t want to debate my views' and yet, you must see that your views are unconventional and that debating is really the raison d'etre of sites like these??
I do have to agree that your son would be better off at home since it's hard to understand how any school could meet your rather contradictory and unusual requirements. PFB means 'precious first born'.
I also think you may need to explore why you are arguing that extra-curricular activities and teachers who are willing to devote extra attention to their pupils over and beyond the hours which they are paid for as A BAD THING. Surely, you realize that most parents see these things as positive and, in fact, often come on this site and others and visit schools in person to request MORE ATTENTION for their children and a wider range of extra-curricular activities.
Either you really believe these things to be bad in which case you are probably alone on this site and in a minority generally in these views or you are saying this to justify your own unwillingness to devote additional time and provide extra-curricular activities to your own students as indicated in other threads. Perhaps you have dug yourself into a corner because of comments you've made on other threads and now find yourself arguing a position that you don't really agree with yourself?
Some of the things you say also continue to make me wonder whether you really do have the experience of teaching that you say you have. You don't seem to really understand the concept of extra-curricular activities at all, for example. As Poppyella has said, extra-curricular activities are OPTIONAL. No child is forced into doing activities he or she doesn't want to do. It's also strange that you argue you would rather have your child at home and don't approve of extra-curricular activities but your son plays the piano and rides.
My children have piano lessons amonst other activities AT SCHOOL during the normal school day as one of several extra-curricular activities. Dc2 is still in kindergarten where almost all of the extra-curricular activities are at lunchtime. I find that the fact that they manage to fit so much into the normal school day means that they are less tired and have more time to spend with us at home which is one of your concerns (that I share). Dc1, however is in prep school approaching secondary school age and is now keen and able to take part in activities after school as well as during the school day. This is HER CHOICE and since she is sporty and confident extra-curricular activities have been really beneficial for her such that she is now competing in various sports at town level and is developing her skills and confidence further.
As others have said to you, it is a good idea to look at the long-term when choosing a school for your child as his needs will change. While you understandably consider extra-curricular activities too much for him now (except the piano and riding) you may find that you and he change very quickly and it will be much more time consuming and tiring to be taking him from one activiity to another if none are provided by your choice of school. Even if your son never decides to pursue extra-curricular activiites it is certainly strange to be put off by schools that offer this which is what you imply. If a school offers a lot of activities it's often a sign that they really care about developing the children as whole people and is likely to be a sign of really committed teachers (something I think you're ambivalent about but most people consider to be a positive thing).
You also said,
'Besides many parents I see really use after school activities because they need them whilst they themselves are at work and cannot pick their children up.'
Maybe this is your experience but it is not mine. The extra-curricular activities my children do are considered by them, by me and by their teachers to be valuable. They range from taking part in orchestras and choir to speech and drama (which leads to LAMDA exams) and netball. I am able to pick my children up from school but THEY make the choice about which activities to pursue.