I noticed that if you check feedback of other sellers there are negative feedbacks that the ID of the Buyers is not disclosed or Hidden.
No.
All buyer IDs are hidden.
leave Negative feedback too sellers for reasons the Seller can decide are not justified.
The Seller?
The one being criticized?
Seems fair.
Personally, I regard feedback as an historical remnant of the early 20th century days of the internet, when online shopping was cool and and dangerous, and not how grandma gets her toilet paper delivered.
EBay should drop it.
The main problem is that too many members (buyer and sellers) get into shouting matches on FB, instead of using the Resolution Centre to work out a reasonable settlement.
Those negs that read "never paid" or " refused to refund on item received broken" are from members who did not use the Resolution Centre.