Why are L2TP/PPTP connection never re-established after a lost connection?

Why are L2TP/PPTP connection never re-established after a lost connection?

Why are L2TP/PPTP connection never re-established after a lost connection?
Why are L2TP/PPTP connection never re-established after a lost connection?
Yesterday
Tags: #VPN
Model: ER707-M2  
Hardware Version: V1
Firmware Version: 1.3.1 Build 20251009 Rel.67687

I don't get it: Why are IPSec-VPN-connections always re-established, but never L2TP or PPTP?

It happens on both my two ER605 and my ER707 between three sites and throughout the Firmware history. 

What is so f**ng difficult to re-establish these after a connection loss?

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