What I do not get is why did the Klingons not help T'Kuvma's flagship sooner. For six months, they left a weapon of both high strategic and tactical value abandoned in the field. How stupid is this race? This would be equivalent to leaving a Gerald Ford-class aircraft carrier, one of the most advanced ships in the US Navy, stranded while the rest of the Amercan fleet goes off to war. This would never happen. What's worse - it now seems the Klingons had only two ships with cloaking technology. The other was sacrificed to make a point. I have heard it said recently that writers who write about war now for Hollywood, that many of them know next to nothing about war. This episode is a prime example of that. No nation at war would leave a ship this valuable abandoned in the field. It's lucky for them that the Federation never made an attempt at acquiring this ship.
The Federation was busy leaving their own ship abandoned. Though they had time to go back and get a telescope.
The odd thing is that they showed Lorca destroying the Glenn, so it's not as though the writers are unaware of this. It's just another example of the writers opting for what's convenient rather than what makes sense, like Burnham's actions in the first two episodes.