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Lol, none.
Relationships take effort but they should not be difficult. You shouldn’t be fighting all the time, and you certainly certainly should never compromise on big issues. And they should show you respect. Not the “you must obey me” bs people try to pull but just respect your autonomy and respect you as a person. >

This is the answer. >

My wife and I have been married for almost 30 years. One son. Life can be a pain, but our relationship? Effortless and complimentary. >

I've been in a relationship over 3 years. Few arguments, but none of it is 'work' and has never felt like it. Ones in the past certainly had but that's just a cue to move on if it's chronic. >

Building a life together is work, and building a life together is long.
Which means there are inevitably going to be disagreements and frustrations.  You work through them if you want to build a life together.  Thus, relationships are work. >

Agreed. There’s no such thing as an effortless relationship. People have their limits, but if there’s zero effort to work through differences, then what’s even the point other than random convenience? >

How many relationships have you had OP?