The following is from a Quranist perspective, i.e those who follow Quran only as a Last testament (while believing in both Old testament and the Bible)
Note that most of the issues you highlighted are related to sects in Islam that preach to wear this/don't eat this/pray like this/don't do this/do this/etc.
While Quran is a Godly message, it describes a believers's path to rise beyond this wordly matters. Prayer for example, is only intended to "remember God" i.e in one's consciousness which would ultimately lead, day by day, to a constant reminding of one-self of the existence of God (because saying "God exist" isn't the same as actually being conscious of God, which is sadly absent in many)
20:14-15 "I am GOD; there is no other god beside Me. You shall worship Me alone, and observe the Contact Prayers (Salat) to remember Me.The Hour (end of the world) is surely coming; I will keep it almost hidden, for each soul must be paid for its works.
The righteous/pious, a high level that a believer may or may not reach, and what is to be righteous by God Himself ?
2:177 Piety is not to turn your faces towards the east and the west, but pious is one who believes in God and the Last Day, and the angels, and the Book, and the prophets, and who gives money out of love to the relatives, and the orphans, and the needy, and the wayfarer, and those who ask, and to free the slaves; and who upholds the contact prayer, and who contributes towards purification; and those who keep their pledges when they make a pledge, and those who are patient in the face of adversity and hardship and when in despair. These are the ones who have been truthful, and these are the righteous.
The whole worshipping/serving God's purpose has no point but to Remember God in order to become Righteous.
2:21 O people, serve your Lord who has created you and those before you that you may be righteous.
13:28 They are the ones whose hearts rejoice in remembering GOD.
Absolutely, by remembering GOD, the hearts rejoice.,
13:29 Those who believe and lead a righteous life have deserved
happiness and a joyous destiny
People are now arguing about very small matters, sometimes, arguing about such matters' absence in Quran itself -expecting God to tell them every aspect of life- ignoring the whole purpose of the so called "religion".
I hope my answer give you a little insight of the contrast between the Godly Islam "Submission to God" and what's out there. I also think reading Islam SE questions/asnwer may not reflect the "Godly Islam" as much as it reflect what's out there...Good luck!