a) SD>32GB by definition is SDXC+exFAT. There's no way you can read a stretch goal that promises support for µSD-Cards >32GB as "saying nothing about exFAT".
Goal #1 - $1,500,000: MicroSDHC support up to 128GB Once we reach the first goal, every Jolla Tablet will be upgraded to support microSDHC cards up to 128GB! You’ll never have to worry about running out of space again. Currently Jolla Tablet supports cards up to 32GB, besides having 32GB internal storage.
c) Even though the poll was supposed to bring up choices of alternative file systems, 2 of the three most voted answers opted for exFAT. (The most popular answer doesn't even have 150 votes - is this "the community"? If so, the community voted for exFAT support in this answer.)