Thanks for all precious answers...
There is an impossible issue regarding Nvidia may support older cards with Vulkan driver on a close date.
There is a maybe about Godot 4.1 will support openGL in next stages.
As far as I know from the info in the net,
most of the Android systems, on little older mobiles, have no support for Gles 3.0 (maybe Vulkan too)
For this reason, I use Gles 2.0 with Godot 3.x.
I believe that brand new computer and brand new mobiles dependent development does not exactly fit with the Godot "free" philosophy, especially in these economical crisis days and specifically in third world countries.
At least, can anybody tell me whether the devs will continue to develop Godot 3.x for some additional years?