[Vrul]

You can get rid of hard coding each class with:

--Check Player's Role

local playerRole
local function CheckRole()
    local specIndex = GetSpecialization()
    if specIndex then
        local _, _, _, _, _, role, priStat = GetSpecializationInfo(index)
        playerRole = role == "DAMAGER" and priStat == 4 and "CASTER" or role
    else
        playerRole = nil
    end
end

local eventHandler = CreateFrame("Frame")
eventHandler:RegisterEvent("PLAYER_ENTERING_WORLD")
eventHandler:RegisterEvent("ACTIVE_TALENT_GROUP_CHANGED")
eventHandler:RegisterEvent("PLAYER_TALENT_UPDATE")
eventHandler:RegisterEvent("CHARACTER_POINTS_CHANGED")
eventHandler:SetScript("OnEvent", CheckRole)

Or you could just use the normal roles and replace

elseif playerRole == "HEALER" or playerRole == "CASTER" then

with

elseif isCaster then

by using

--Check Player's Role

local playerRole, isCaster
local function CheckRole()
    local specIndex = GetSpecialization()
    if specIndex then
        local _, priStat
        _, _, _, _, _, playerRole, priStat = GetSpecializationInfo(index)
        isCaster = priStat == 4
    else
        playerRole = nil
    end
end

local eventHandler = CreateFrame("Frame")
eventHandler:RegisterEvent("PLAYER_ENTERING_WORLD")
eventHandler:RegisterEvent("ACTIVE_TALENT_GROUP_CHANGED")
eventHandler:RegisterEvent("PLAYER_TALENT_UPDATE")
eventHandler:RegisterEvent("CHARACTER_POINTS_CHANGED")
eventHandler:SetScript("OnEvent", CheckRole)