Wedge is always going on about why the Imperial Forces were finally overcome by a rag-tag group of rebels. He thinks it because the rebel scum had more heart, but that is just BS. We’ve got heart. I know ... I have seem them blown out of several troopers.
I say it was because Vader wimped out and got all “I’m Your Daddy” and junk. But I also think that there were some problems in making of later clones.
Take a look at this lot make late in the Empire period. No consistency in looks, height, and grooming.
I think lord Vader is just a little disappointed in this lot. Or he is thinking about cutting in line for coffee.