autoremoval kernel

It would be good to delete old kernels from GUI. Now i run a apt-get autoremove from command line and delete almost 7 Gb old kernel files! I forget to check it, because every function that i use is avaliable via GUI.

Why Proxmox does not do any workaround this kernel cleaning process? We had not touched this, yet it seems our disks are getting clogged and the upgrade process is prolonged only due to so many kernel checks and yeah, what a day. So how does one, "safely" clean up OLD Kernels, and why they are...