Just for my .02:
I had very low T measured at age 22. First test was 33 (!), they thought there must be some error, retested and it was 40.
The bizarre thing for me was that I was not symptomatic in the typical way. Still grew body hair, fair amount of muscular strength and muscularity, etc. We only found out because I do have one symptom: no libido at all. Realized I hadn't ejaculated in years, hadn't really thought about it (was highly engaged in academics in ugrad, ivy league law school, it just slipped through the cracks). I went to a doc for anemia and realized that the libido issue was worth mentioning. Doc gave me a full blood panel, and what do you know...
I had a similar concern as you: the thought of being on a medication your whole life was and still is daunting. I don't like being on medication in general: I would like to have a body that can function on its own without my having to give myself injections &c. And moreover, having a consistent source of the medication is a bit of a pain for people who have a spell that involves moving around every year or two like me.
To Brick's question of "Why would you not?", my answer at first was because I was not symptomatic in the typical way a low T patient is. I was, however, severely, severely anemic, which we initially thought was due to a number of things they ultimately ruled out: an ulcer of some kind, autoimmune problems, cancer (!), and several other things. But for reasons that were never really fully explained, my blood values balanced out when I was using the traditional dose of T Cyp. So that's why I take it.
OP, I will say that at least for me, using T Cyp wasn't one of those things where you wake up the next day feeling totally different. It took a couple weeks/months for me to notice anything at all (eg, started having some morning wood). Question for you is whether the longer term costs of being dependent on the medication are worth the benefits you get from the medication. For me, they keep my blood levels balanced. But as a matter of traditional "low T" patient profiles, I wouldn't be taking it if I didn't have the blood issue because I don't notice substantial benefits in any other areas (my libido never really came back, perhaps as much a psychological thing as a physiological one).
I've been on TRT for 7 years now, and that's just my experience.