oh i understand your journey too… back and forth and around…
i am a psychological counsellor and life coach with a real license (!) and work with the DAOIST Philosophy maybe you have heard of Laozi.
I combine western psychology with Daoist life philosophy to help people with stress, decisions, order in life and to find themself and have a solid self-esteem and calm life.
So I teach, I have Q&A´s, I do online courses and counselling / Coaching and always feed my work with Daoist knowledge from the DAO DE JING Verses and their comments.
So therefor I need a solid PKM, or Database, how you call it, to find attachment points to the question of the client and connect it to the wisdom of the verses in the book to show to background of the meaning.
e.g. vers 1
so is very looks like this in English ( I use German language ).
and then I do connections to other verses or tags like “cosmology” “emptiness” “self”… all that can be seen in the vet but is not directly written. so I find quickly the passages of the book where a certain topic is mentioned or can be seen/extracted indirectly. so the real text is one thing. BUT the real work is the indirect connection, the second and third level of meaning. the interpretation , the grouping of topics…all that need a really solid way of attacking it. otherwise you will find nothing then you started a bit.
This book is just 81 short verses but I covers the same topics or even more than a book like the Bible inclusive all connected books. so 1000000000tousands of pages with connections.
This is the real reason I am now a bit obsessed with the working of links, backlinks , references, tags, groups, replicants, and the difference between all of them ( which is not 100% real yet but I work on it hard 
) .
Theses connections are the basis and to money and the product afterwards I will get out of it like @IvanPsy said, the reason you do all of it, is to get something out of it, and produce something new. I do online courses, videos in future and coaching with it. and what else comes in future.
Till now DT3 was like a big tank of storage to put everything in it. And NOW comes the time to connect the dots and get all in order and get something OUT of DT. I love DT but its a big tool and a lot to understand and learn, so it takes you and shakes you, it needs your attention, and it want you to get all in - > then it gives you something.
THEREFORE I need and answer if DT3 can do all what I need - and in which way - and want it can not do, ( what maybe others can do better ) and if I really need it - or there is a workaround which is not too big.
The manuals and also not always so easy to read, cause they are written by someone who has a deep knowledge of the thing already and sometime its hard for such knowing people to get back to their early days where you can not understand what the beginner dont understand. the beginner view to a product is not a minimum view of a professional DT user divided in small pieces and explained. the pro user does things a beginner won’t use or do, because he would be frightened to do complex things in the beginning or dont understand them deep enough to get the point of doing it.
BUT I will fight myself through the manual- I like the saying. RTFM - read the fux*ing manual
Maybe you folks can help me answer the question with my DAODEJING work, if that can be done good with DT. IN Obsidian the backlinks are easy to jump between the verses and connect dots and tags and everything. I hope that can be done in DT too the same way.
@BLUEFROG will DT add some more of those fancy “PKM” named features in future, like real backlinks (as I understood now the DT are not the same as in obsidian) and putting links to certain words in a file not only the whole doc. cause I need the exact word to be the end of a link…
and getting more features in writing tools like iawriter or bear… ( and pls dont ask me what I am missing in DT: this is the problem that I can not tell what DT can do - the other tools have some sort of feature list on their website, I could not find something like this about DT. - but maybe I overlooked it.