Grammy, that is why I left LOTW....it was dictating the lesson plan. I couldn't do deeper units or topics the kids were interested in because of the letter that had to get covered. I do let seasons take a bit to much of a front seat....but perhaps that will be the next thing I rework.
I do slide the letters in, it isn't that we don't cover them....I just don't hold one up a week.
I understand what you're saying, but realize that I don't let the letter of the week dictate what I teach. I do a few "Aa" activities, but we cover lots of other things, too. Just because our letter is Aa, doesn't mean that we can't do anything else that is fun. My teaching is mostly impromptu.
One thing I like is our alphabet tree. I have large foam letters hanging from the tree. I ask the kids to find any particular letter they want to, thus covering more than the letter A.
We look and talk about how the letters are all different shapes, find the letters in their name, etc/
I like the individual letters to get a bit more focus because kids soak it up if they can associate the letter with an object, such as an apple, or pumpkin, etc. That leads to more discussion beyond what the main letter of the week might be. We branch out into many other areas all the time.
I have a large book of all the animals of the world. They love to hear what animals names begin with each letter. At the same time, we discuss any animal that they find interesting or have questions about.
Really, there is no right or wrong way to teach the alphabet, as long as we do it.