As a biologist at heart, I do believe bird study should be required. In recent years, national and local debates about environmental issues are lost on many, simply because they aren't watching the flora and fauna in their community. Any required MB's should focus on mindfulness and observation, less on regurgitating facts.
I do believe that this shenanigans about the age 18 deadline should end. I don't think we should encourage scouts to procrastinate or nudge adults to earn eagle, but if after earning 1st class at any age, they should not be discouraged if they are so inclined. Wood badge should be open only to scouters who've earned 1st class rank. I guess that means that cub leaders and such will need to master some outdoor skills ... pity that.
I'm ambivalent about the service project. (Which wasn't required early on.) I think it should be turned into a "project management" or maybe "grants and contracts" merit badge. Should it be required?
Likewise, there should be a required "pedagogy" (a.k.a., EDGE) MB rather than all of these scattershot requirements. Maybe require it for Star, and fold in that 2nd cyberchip requirement.
I think homemaking will need to be added as fewer young adult men are getting married, nor are they going into the military and learning about living an orderly life. Again, not sure about requiring it.
I'm not that bothered about the three ranks at once schema. Depending on what your troop/patrol does, it may need those tenderfoot scouts mastering selected 1st class skills before ranking up. But that should cut both ways. If a 2nd class scout seems to have forgotten a skill for his next rank that he had mastered the year before, he should be requested to demonstrate it again.
Regarding BoR's and testing: we need to accept the fact that there will be variation, and not brow-beat scouters who do things differently. Recommendations of when and how.