Interesting update.
Team of 3 of each sex but with 2 counting scores is one the one hand a good balance, but on the other hand does rule out some potential big names. If that rule had been in place for 2024, Brazil and Belgium could potentially have made the final. The likes of France, Hungary and Romania couldn't. They have to weigh up wanting the final to be the highest quality possible v making sure they have enough teams able to qualify.
On the point about NOCs nominating which scores rather than it being the top 2, it reads to me like what they mean there is an NOC designating the lineup after qualifications? So for example if the US in Paris had decided they wanted to sit Simone out, they couldn't use any of her scores to qualify to the mixed final. But instead would have to choose which 2 or 3 athletes they wanted to use in the final and those would be the qualifying scores. If so, sounds like that could get complex if someone gets injured between qualifications and the mixed TF.