How hard will be to add feature to users to mark reads by bluk actions.
It will be nice if We cluod bulk “READ” topics.
My users want to have clear NEW lists
That feature is already available. If you scroll down to the bottom of your new topics list you will find a Dismiss New button 
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So in this case you would click or tap through to read what you want to read on the new tab, then press Dismiss Unread at the bottom to clear the leftover stuff you do not want to read.