I am sure those systems deserve a modern renovation, but as a general matter, I think the particulars of game systems matter less, overall, when it is not a mechanics heavy system like Pathfinder and DnD 5e...or Rolemaster. It mostly comes down to rulings over rules...which is why rules lite systems, e.g. Mausritter, Knave, Into the Odd, have play in the OSR/NSR scene.

I do not know where on the crunch spectrum the systems you mentioned fall,