@Sprucewillis
No for me it about refusal of a whole food group. People with many medical conditions still manage to eat some vegetables (hidden or otherwise). Food refusal is something else and something I would choose to avoid in a partner. In my house you eat what you are served or you don't eat. My DC have a very healthy relationship with food. I wouldn't want to raise someone else's adult child.
You've been very fortunate, and so are your children, that they don't have any food issues which you would have had to deal with. You would have found very rapidly that 'eat this or there's nothing else' will not work with a child who really can't eat certain things because of the texture, smell or other sensory issues.
My son ate everything with enthusiasm when first introduced to solid food. I think things went wrong early in his toddler years when he started having recurrent chest infections and ended up with glue ear. He became a very fussy eater for years and years, although fortunately the things he would eat included a few vegetables and fruits. He was perfectly healthy once he outgrew the glue ear. I decided early on I wasn't going to have mealtimes turned into battlegrounds. I never made an issue of it. He ate what he was comfortable with, which was no big deal to me to keep in stock and prepare (pasta, chicken nuggets, peanut butter sandwiches mostly) and very slowly indeed he ended up eating other things too and by the time he came back from his first term at university he was eating just about everything. The day he said 'calamari is one of my favourite things, can I cook it for dinner' was a red letter day!
Meanwhile, his older sister, who is on the autistic spectrum (he isn't), would eat almost anything from the start and has become a very good cook. Just the way things fell out.
I watched the struggles two of my aunts had back in the 1960s (so this isn't a new thing) with 'fussy eaters'. I don't know why those two cousins had these issues when their siblings didn't. My brother and I would eat anything and we were being given the same sort of food. My aunts were both good cooks, and so was my mum.
My husband was also a fussy eater as a child but his mother was not a good cook, so I can understand it there, as her food wasn't enticing. It's not been an issue in adult life.