The rank of each user is calculated according to the rank.
Wait, what?

Can you please explain what you meant by this sentence?
At that time, the forum was very friendly,
Is it not anymore? And what time? You joined the forum less than a year ago, but you are using this reference as if you've been around even before the merit system was introduced or way before that.
Thirdly, why are there more or fewer ranks of members here? Why are they seen in big and small sizes? It is because of their rank.
Bro, you are either confused or having a hard time explaining what you are thinking, maybe because your English is weak; because some of your statements basically make no sense.
Along with the benefits of using the forum, there are some disadvantages, as those who spend a lot of time here have to sit for a long time and pay attention to this aspect with different concentrations and other aspects.
The forum has no disadvantages unless you make some yourself. As others have already said, one doesn't need to spend hours sitting on their computers or with their mobile phones to pay attention to anything happening in here, you do it whenever you want and can.
P.S.: You didn't need to add "Secondly," "Thirdly," etc., before asking everyone's opinion on a point. You could simply write, "Please share your opinion" instead of writing, "Secondly, please share your opinion".