Ah, lemme take an interesting story.
When XUV700 was launched, people were all excited, “damn! such a posh car..blah blah”. Sales were off the charts, waiting periods were almost 2 years. People were like - This is the best Indian car ever, this will rule the markets. Down the line, Scorpio got re-launched, it was not so fancy but can do all terrain hunts. Some may complain, highway driving isn’t that smooth with scorpio but it all depends on the driver and surface.
So, here we are 28nm is scorpio which can be used for all kind of terrains.
Infact, a SoC has multiple technology nodes in a chip. Memories (sram, dram) being fastest (3/5-nm) and other logic devices in higher nodes to balance the performance & costs.
After telling all these (boring) stories. India will mainly start with OSAT which is mainly on assembly & test. 28-nm has wide number of applications and save insane $$. The whole EV ecosystem relies on mature technology nodes as space isn’t a constraint. You will be surprised to know only few OEMs can afford 3-nm technology (mainly mobile fone manufacturers).
Happy Learning!