According to the narrator of the video addressing Texas constitutional amendment elections, it is important for registered voters in Texas to vote in Texas constitutional amendment elections because

Voting in Texas constitutional amendment elections is one way for voters to hold members of the Texas Legislature accountable.

The outcome of Texas constitutional amendment elections is only valid if $62\%$ of registered voters in Texas participate in the elections.

Texas constitutional amendment elections is how registered voters in Texas elect officials to the Texas government executive and legislative branches.

Voting in Texas constitutional amendment elections is one way for voters to hold members of the Texas judicial branch accountable.