ahhh... I'm fond the days from when you could run whole applications in all of 4MiB -- GUIs included.
In the G3 and G4 days with easy-open computers it wasn't uncommon for one designer to put out a call for more memory to do something intensive, like edit a poster, and other designers would sacrifice a stick or two to the cause. When the job was done they'd put the memory back in the other machines.
The department had another identical workstation that wasnt being used just then and I pointed out I could swap half of it's RAM to his machine for the day. He and his boss looked at me as though I was insane. An hour later they called me and asked me to do it, the model run completed in a couple of hours and I swapped the RAM back.
He had a Quadra 950 with 128MB of RAM, which required some pretty exotic SIMMs. That would be a pretty expensive machine in today's money. This was for handling Adobe Illustrator files with large embedded images.
So just imagine the possibilities for ESP32 applications.