I used MP products before their current community culture existed. I've been homeschooling for over 25 years, and am now homeschooling grandchildren. I am fairly familiar with most of what MP has to offer, and extremely familiar with a lot of it, over decades' experience.
It is my firm conviction that there is no essential, planned synergy between the various subjects or components of the day, as laid out in the daily guides. Any strong English language arts will complement formal Latin study (and vice versa). Any logical, developmentally appropriate math will help the child advance in logic. Literature is literature, and MP study guides are not the be-all and end-all; there are lots of ways to talk about books, and many, many excellent resources.
THAT you are deliberately educating your child in history, geography, grammar, effective spelling and phonics, Latin, logic, science, math is the secret ingredient. It's you. It's your home. It's the access to proper pedagogy - no matter where you buy your books or learn how to teach - and your daily diligence. It's your commitment to teaching the child in front of you, to not wasting his time with ineffective busywork or untried pedagogy, to giving him a well-rounded life and wonderful experiences and memories, to protecting his space to follow his own rabbit trails after your formal lessons...
This is the synergy that you need for your success. A functional homeschool and a happy family, and good curriculum. MP designed their year plans to include a developmentally appropriate and academically sound scope and sequence in every subject. Their year plans are not integrated and not unit studies. Each course stands alone, if the child is equally advancing in his other subjects. Whatever they're allowing or encouraging in the culture about "doing it all" or "doing it right," I do not believe Cheryl Lowe ever had in mind anything of the kind! It's bullying, peer pressure, fear and superstition. That perspective is opposite of the goals or fruits of classical education, or of any effective system of education.
