I feel that the incremental units might simplify things for some, because they minimise amount of math you have to do during a routine shop (maybe just me but figuring out which is the biggest seed pack I can afford that leaves at least 150 is less thinking than calculating and entering how many seed exactly to leave 150 - I guess it removes just a little choice paralysis, and also a few fewer button presses). I think people who Clucky Clicker regularly might use the 500 seed -> 50 egg more often! I'm happy for more opinions on the matter.
That is fair! I guess I really only use it when I'm converting seeds to eggs if I'm short, and usually I don't want to use up excess seeds so I just... buy the exact amount of eggs that I want (i.e. if I need 300 and I only have 168 I just buy the 132 I'm missing). But that said I'm sure there are plenty of people who don't want to do the mental math, haha.
I think an option to convert all seeds into eggs would be helpful, I don't have much use for seeds (I use the bugs to feed chickens) so having an option to quickly convert all seeds without having to do the math would be helpful 
To be honest I keep accidentally buying seeds instead of eggs because there’s no separate fields / categories
that may be a me thing but I second the fields addition soo bad for my blind goofy self