Just like there are stages of thyroid dysfunction, from myxedema coma on the hypothyroid end, to thyrotoxicosis on the hyperthyroid end, there are ranges of adrenal dysfunction. If one has Addison’s, then there is no question that one must be on HC for life. And if saliva cortisol labs show a flat-lined pattern at the bottom of the range all day, then one may need to supplement with HC too. But for most others, supporting the adrenals with adaptogens and slowly raising thyroid levels can also work. This is because thyroid and corticosteroid binding globulin (CBG) have an inverse relationship. As thyroid levels come up, CBG goes down, leaving more cortisol free. So raising thyroid will raise cortisol levels.  But any increases must be done slowly–weekly thyroid increases are too much too soon and do not give the body time to adjust.
Are you on supplemental HC because of flat-lined saliva cortisol labs? Is it working for you or not? Please state your daily HC dosing schedule and any positive or negative changes you’ve experienced.