A made a new account just for this,i have found that there exists an extension called Resume Media V3.40 (Win/Lin):
https://addons.videolan.org/p/1154044
I think this solves all the needs we all wanted on resuming from previous playback.
To install you go to Tools->Plugins and Extensions->Extensions(on the left as category)->Resume Media v3.40.To enable you then press on Active Extensions tab then press reload extensions and it should be working now.
I just hastily tried it on one of my series playlists(I have it in the media library as a folder),pressed play(on the whole folder) and it continued from previous place i stopped it.Perfect!