Quick History:
I was a Protestant for the first 50 years of my life. I still have family that are either Pastors or in leadership positions. I have literally put several hundred hours ( 400 +/- ) or so into Catholicism since January 2017. My wife and I enter the Church at Easter Vigil. My wife and I are both far more Catholic now than Protestant and we love it.
I said that to help you understand my view on this.
Both my wife and I early on thought that Catholicism was too complex. Remember, we came from the alleged simple system you speak of. Catholicism was completely 100% new for us and being so different than protestantism it seemed too complex. However, I continued to study and learn about Catholicism and found that it is very Christ centered and my eyes have stayed on Christ through this journey.
I know from experience and many that I have seen around me that protestant “simple” isn’t really simple. Working on your relationship with God takes commitment, the reality of the committed Protestant, I’m talking about the truly faithful Protestant that has what sounds like a simple plan is that they go to Sunday School on Sunday morning, Sunday morning worship, serve in leadership roles or in other areas of the church, go to Wednesday night Bible study, do devotions with their families, have church gathering after gathering, read their Bibles often, go to additional men or women’s Bible studies in addition to the Wednesday night one. Faithful protestants also visit the sick, donate their time to charity, do prison ministries, etc. etc. etc. So you talk about a relationship with God, the faithful protestant is truly WORKING ON IT many, many, many hours per week.
Here’s what happens to many protestants: They slowly stop doing things things that I just mentioned and the next thing you know they haven’t attended church in a year or two or three. So simple is not so simple because it takes work to have a relationship with God even in a Protestant church.
Take it from someone who knows Protestantism, it sounds simple, but it’s no more challenging than living as a faithful Catholic. I prefer the Catholic life obviously because living Catholic for me ( remember I’m not fully there yet ) has drawn me as close or closer to Christ than I’ve ever been in my life.
Catholics like Protestants have to keep their priorities in line with their attention on Christ. The grass is not greener on the other side. I’m glad that I discovered the Catholic Church.