Right.Up.Front, I’d like to state unequivocally that I am the last person to ever advocate ‘one size fits all’ or that ‘what works for me will necessarily work for you’. We can, however, learn from each other’s experiences, tribulations and mistakes. That’s really what this forum is all about.
I’ve been eating keto for 5 years and a month. For 4 1/2 of those 5 years I have weighed 145 pounds with BF of 14-15%. Those numbers match my weight and BF during the peak of my youth when I was a middle-distance runner during ages 17 - 23. I am now 76 years old and I will take it! 
Yes, I have definitely been the beneficiary of benevolent genes. I ate bog standard SAD all the years of my life until I started keto at the age of 71. I drank a lot of beer and ate pretty much the equivalent of a loaf of bread daily. What I was not was a sugar-holic - I was never much interested in ‘sweet’. During the decade of my 60s I gained about 30 - 35 pounds of excess mass. All of it came off within the first 6 months of keto with no difficulty. In fact, I never felt the slightest bit of hunger even when I was eating a 1000 calorie per day deficit during the first 3 months of keto.
I’ve been a member of this forum for 3+ years and one common comment is that many folks say they could not continue keto if they had to track and measure their food every day. OK, I accept that for some folks it would be an onerous task. Yet, at the same time, most reports of lack of success - either weight loss or maintenance, dealing with illness - come from these same folks. My first and prime suspicion is they’re overeating carbs.
20 grams of carbs is a very small amount. If you think you can guestimate it you’re just fooling yourself. In many cases, due to metabolic dysfunction and/or insulin resistance and/or specific food issues, you will have to consume even less carbs per day and your chance of guessing correctly is non-existent.
Of course, some folks might experience other issues than simply overeating carbs - food allergies and/or reactions, PUFA overconsumption, for examples. But to sustain ketosis the carbs are the most significant thing over which you have 100% control.
If you have no problems remaining consistently in ketosis and sustaining overall metabolic health - then I salute you, carry on! But if you experience any of multiple problems and don’t weigh and measure - carbs if nothing else - it seems to me your solution is very simple.
Just my opinions.