Should support wards go by recall?

I am no expert, my silver status for the last 4 season is proof of this. However, there is something minor that I have been pondering about recently.

Why do support warding items reset by recall?

I can understand that there is already trinkets that are set by timer so having two warding items set by timer might be redundant yet, supports are the least fed character in the game (or at least supposed to if they don't steal their ADC's cs) so why do they have an item that requires them to recall?

The fact that supports are given 4 wards if they complete the mission for their starting item as well as finish the starting item itself is by no means of no value nontheless, it means that support will need to die or recall to regain their warding stacks which reduces the use and potential of the support having to constantly recall instead of being pressure on the map by protecting or assisting their carries. Also, very often the support will switch to a sweeping lens to clear out the enemy's vision causing the support to rely solely on their support item (as well as pink wards which the enemy can clear once the support has stopped pressure due to its recall).

I am certain riot had their reasons for why support items are set by timer instead of by recall therefor I would like to understand it better as well as discuss the reason with the above statement.

Thanks for reading see you in the rift.

[sg-kiko]