i do think that if you are a neat freak/control freak then it's not for you, definitely, but that doesn't make it a 'new-fangled stupidity'.
and it's just utter rubbish that you are fairly limited in what you can give, really, so that speaks more to your sil's cooking than anything else. certainly if you follow AK there is no question that your child will be eating a very varied diet from a very early age. (to be fair to AK, i think she represented a genuine leap forward from the packet rice/grain mush/jar weaning that was popular when she started.)
re: choking. no wish to call down the gods here but i have over 6000 members on my site (nothing to here, of course) and it's been going for five years, with well over 300,000 posts. afaia, not one reporting a choke that required anything like a blue-light to a hospital. and tbh it's the sort of place a furious parent would post.
i also have friends/family who work in A&E (two paramedics, one paed consultant), with careers adding up to fifty years on the casualty scene... not one can recall a choking fatality on their block.
has anyone ever seen anything on here? i remember one post where a puree-weaned one year old (or so) had a bad choke on some finger food, so i'm not saying that chokes don't happen... just that a particular weaning method is no insurance. after all, by what, nine months, surely puree-weaned babies are onto finger food anyway?
i am always baffled by the strength of feeling over what cannot be more than three months in a kids' life, where one has mush and the other has solid food...