[CiNcH]

I've read the article a few days ago while the article is correct but seems a little biased

It is not biased in any way. I am just a Sony TV owner who got really frustrated and decided to write a review. My heritage is HTPC. So I might have higher demands than most. Sony TV is certainly no replacement for people like me. Sony however even failed on everyday Joe standard things like watching broadcast TV or Amazon Video.

I don't think that other TV manufacturers are a lot better. But I only have a Sony ("Smart TV") and can therefore only compare on the very surface. As everyday Joe, I would probably get myself a Samsung or an LG. They at least get the standard things right. As an advanced user it is certainly the best option to go after a box. Give it some time and you might find out yourself. You should not think that you know it all the day after you purchased that TV.

I bought the Sony 900E and so far it's snappy and responsive with Nought.

That was my first impression too. Sony Android TV is like Windows 95/98. It gets slower and less stable every day, the more you use it and want to do with it. Just check out Sony communities. Every second post suggests to perform a factory reset...
I will yet have to see indeed what Nougat brings to the table. But from experience, major updates made it even worse, as the underlying system did not get adapted. Sony promised a significant performance boost with Marshmallow already which did not happen though.