[mrpopo]

I'm not assuming linear adoption. I explicitly said that even if adoption was FOUR TIMES faster than now, the amount of renewable energy would barely reach the same amount of primary energy as we use now by 2050.

This is a optimistic scenario. Current trend is mostly linear. See:

Wind power generation, world: https://ourworldindata.org/grapher/wind-generation?tab=chart...

Solar power generation, world: https://ourworldindata.org/grapher/solar-energy-consumption?...

You can choose linear/log, it doesn't look exponential to me.

Add to this the fact that primary energy generation is increasing all over the world, so the share of renewables is increasing even less.

The target is 2050. There is no R&D that will get rid of electrolysis and Carnot cycles by then. Maybe by the end of the century if you want. But for the next 30 years, batteries will be in the lead.