Got no issue with the arc ending, and us showing Lorca the door for good - you're right, Trek needs the guts to close off stories more often. But what was the ending? After all that, Lorca achieved... maybe fifteen minutes in charge of one Imperial ship, followed by his unceremonious death. Great. He deposed the emperor but that must happen all the time, and we know the Terran Empire continues without a wobble. Just seemed like a lot of build-up for, well, no real resolution. Sure, not all plans work out (see also L'rell) but when you're telling a story, '...and it just kinda didn't work' is a rubbish ending.