Because Amazon opened up the development of Alexa Skills to anyone with the free Alexa Skills Kit (ASK) in 2015, anyone can create an Alexa Skill. As Alexa uses Natural Language Programing (NLP), those looking to build a skill don't need to worry about complex speech recognition. The ASK tools also makes it easier for novices to work with sophisticated NLP ideas.
I suppose it's a reasonable first effort, and I don't know if the abilities missing can be corrected. The skill allows you to "launch" some channels (Direct TV, PBS, Amazon Prime) but not others (Tubi, Filmrise, The Roku Channel). Once a channel is launched, I couldn't find a way to navigate within the channel so it was back to the remote. While viewing DirectTV, for example, when I asked to watch "ABC", or view the guide, Alexa was stumped.
You'll notice in the lists below that many Alexa skills are called by using trigger words like open, start, play and ask. While select skills require you to use specific terms, others consider them to be interchangeable and will work with some or all of these phrases. Over time you'll begin launching your favorite skills by the words you feel most comfortable using. Initially, though, it can be fun to play around with each.