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70 mb is not excessive for a session file and therefore 7k tabs is not excessive. 7 million tabs would be insane I imagine. But not 7k. User proved herself by using it for years that it performs adequately.
My point stands. If browser can lose 7k tabs it can lose as few as 7 and such bugs should be fixed.
If you can’t name exact point between 7 and 7k where “reason” ends you have to learn more about proper programming. So you could realize that the actual limit is far from that, and there are still a lot of things to improve so all users could get benefits, not just a few.
It matters. When I say browser I mean an application where user can design their own workspace and have it saved for further adjustments. Mobile browser concept for opening URLs from other apps is very far from that.