With pretty much ten years of teaching under my belt I know how to sort out a decent lesson. Moreover, I would be throughly embarrassed standing in front of students not having made the best attempt I am capable of to deliver content. Here are my issues

1) Each school is different. Even if you teach an identical course it will vastly differ from one school to the next assuming your operating above bog standard schools.
2) I knew after X months I wanted to change schools. Primary reason was money but aggro not far behind.
3) Every year admins would get clever ideas to place me here or there to stop gaps. Usually, I'd be on my way out anyway but who wants to write a year's lessons only to be yanked here and there always without pay increase.
4) I have enough subject knowledge to carry the lesson and by the time I've crafted the PowerPoint it's all pretty much in my head.
5) I really detest learning objectives and crap like SWBAT. Lol, really? SWBAT?? Funny because they've had this **** for years but still never glommed on. But now, super teacher students WILL be able to recite the fourth conditional backward. Even in the best Thai classrooms it's Thai EFL and there are limits.
6) I'm learning and growing. Despite teaching the same thing I'm looking for fresh ways especially with technology to deliver content.
7) I've spent waaay too much time in this job already. Despite having a sound knowledge of my course content I still spend huge amounts of time with my head in the job. Before everyone else says me too - no, I've only known one teacher in nearly ten years that beats me for hours dedicated.
8) I put some detail into course outlines.

I find most teachers simply can't be bothered with any of it. A teacher you've already identified as unimpressive will have no lesson plans, course outlines or any direction. That's clear indication of a fraud.

Jim