From a loyal user of WorldQuestTracker

For full level characters, no one cleans world quests in low version of wow unless it's for a special purpose, such as reputation or achievement. Massive amount of world quest icons filling up the map will look cluttered, especially in 7.0 Broken Isles.
I've tried filtering by QuestID, but there are so many world quests for a whole version that the filter list would be very long and not easily recoverable.
I wish there was a switch added to the options to filter world quests by version. Off by default to prevent misleading new players.

This is how I currently implement it, customizing two variables in "WorldQuestTracker_Initialize.lua":
HideLowerWorldQuest = true
HideLowerWorldQuestLevel = 70000 --ignore WQs before version 10.0 DF
--World Quest ID.
--TWW : 80000+
--DF: 70000 - 79999
--SL: 60000 - 69999
--BfA: 50000 - 59999
--LEG: 40000 - 49999

--in “WorldQuestTracker_ZoneMap.lua”
local isNotBanned = not bannedQuests[questID]
if HideLowerWorldQuest and questID < HideLowerWorldQuestLevel then
isNotBanned = false
end

--in “WorldQuestTracker_WorldMap.lua”
local bIsNotBanned = not bannedQuests[questID]
if HideLowerWorldQuest and questID < HideLowerWorldQuestLevel then
bIsNotBanned = false
end