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I don't go to work to socialize, though. I prefer socializing out of work. 
And I don't need to rely on my workplace to socialise, either. As I don't live in the USA and the shorter distances and superior town infrastructure allows me to easily go out and socialise without having to drive for hours. I'd also argue that working from home helps my social life, as I have more time and energy to go out and have fun.
I can still walk or take the bus to the office if I feel like it. Easy. Just live in a nice place.
Agreed with you, OP. However, it is a very personal experience. Some people just feel perfectly fine working from home all the time and I think we need to strive for a society where people can choose.
Similarly to you I would prefer to work 2 or 3 days (so a bit more) from home, but I would not want to work all work week from home. I want to see my colleagues, I want to be able to see their body language, and how they dress, and all the little things they might be doing around the office. For example, we used to bring sweets or other traditional treats to the office as our team was insanely international. After work randomly a group of us could go to have a pint, or we would have lunch together etc. None of this is possible when you are working from home.
Not everyone wants or needs such interaction with their colleagues and forcing them to travel to the office when they can do all of their work from home seems silly and counterproductive. This is why people should be able to choose. >

I have a profession that allows me to work from home, and I have done so for 10 years now. 
I understand what you’re saying and I agree to some extent. The thing that really boosted my inspiration and motivation for the day was getting a dog. I now start my day with a long 1 hour walk with my dog and then I come back energized and inspired to do my work. 
I am very fortunate to be able to do this of course, and I know not many people have the luxury to choose; but, my point is: Yes, change of scenery is important - but it doesn’t have to as drastic as “getting dressed and leave for work”, it can be something as simple as going out for a walk. 
I also don’t miss having colleagues or people to chat with. However, I’ve always been an introvert so that works just fine for me lol >

Anything can be overrated if you say its overrated. 
Breaking Bad? Overrated show. 
Sex? Kinda overrated tbh. 
Having a shit ton of money? Super overrated. 
The feeling of satisfaction after one of your long-life dreams comes true and you attain true genuine happiness? Overrated af. >

I’ve worked from home way before this pandemic. I make myself have a routine. Wake up the same time, get dressed in “work clothes” and go walk the dog. I usually work in my office but sometimes I’ll go to different parts of the house or I’ll go to a coffee shop etc. I’m way more social having the flexibility means I can have lunch with my friends and partner during the day >

What is it rated exactly? Like, what is the scale on which it's overrated? >

I agree. As much as I love my time at home, getting out and working with other people is so refreshing. I enjoy seeing my coworkers every day, and I also like the separation between work and home, rather than the two being in the same place. Makes it easier to relax when I'm home (though I do some online work at home).
Being confined to a phone or computer at home for ~8 hours a day sounds depressing to me. 
I keep noticing that people get out and socialize less and less, with everything that can now be done online, and it's no surprise to me that depression and anxiety seem to be rising. Obviously, the online options have their upsides, but I also think too many conveniences and excuses to not leave the house can be bad for most people as well.