ITT/Fundies, etc are not technical courses. But if you do them too early, you will not be satisfied probably.
Is it too early to think about tec? No. You can think about it. I already did during my open water course, I knew I want to become a technical diver. If you go with 'begin with the end in mind', you can start thinking about tech. This does not mean you start directly now.
But if you have to buy stuff, buy directly the right equipment. I got a lot of wrong advices when I said I want to do tech with less than 8 dives. I was adviced to buy a normal bcd for example. And I had to gain experience. Yes, I agree, but my next question was 'how much experience?' And I did not get an answer on that question, only 'go diving'. I did. I read a lot, I tried to do all kind of dives. I readed standards for courses, etc. And after 10 months I felt ready for tech. And I could sell all my equipment and buy new again.
So for me it took 10 months to start tech after open water, 18 months to finish full cave, 24 months to do my first 100m dive and qualifying dive for full trimix. But to let you know the numbers of dives: 200 after 1 year, 390 was the qualifying dive of full cave, 521 was my first 100m dive.
And people complaigned I went too fast
But back to you. Thinking about tech is not bad. Don't buy the wrong equipment as I did. And go diving, try to find some techdivers as buddy to help you. But also remember there is a chance you quit diving before you got to your goal. I know from a diver who started and said: in 2 years I want to dive to 60m. He bought for his open water his own equipment, twinset, drysuit, etc. A complete techset. But he quitted diving before reaching the 60m and the 2 years. It was not his thing.
Standards state sometimes only 30 dives needed for an advanced nitrox. But I can tell you that for most divers this is too fast. You will do decompression diving and this means you need to have a good bouyancy. I have seen divers doing it between 30 and 50 dives, but in most cases I would not certify the divers then, they most times bought a plastic card.
But I brought 1 diver in a cave with only 50 dives. I met the diver with 25 dives and she said she wanted to become a cave diver. I had an intro to cave course planned and here buddy was 1 of my students. She asked if she also could join. If I said yes, she would buy a drysuit and do the other 25 dives in the 4 weeks that were left before the course started. We did a dive together and of course some basics where not that good, but it was also not bad. A diver with a lot of feeling for diving. It ended with buyin a drysuit the next day and a month later she also came to the caves. I did not pass her. But she was not that bad that it was dangerous. So all was fine from both sides. 6 months later I could pass her. A year later the full cave was done. Now 5 years later the interest in diving moved away like you see quite a lot.
A lot of people only dive 3-5 years, the time a hobby is interesting for them. This is with every hobby. Some divers start technical diving because recreational diving is becoming boring, but then they also quit in a few years. For divecenters not a problem. The money must be earned. This is not different from DIR/GUE, or any other agency.
So my advice to you:
-Don't quit reading about diving and watching videos if you like to do this. It is not necessary, but it won't hurt you.
-Don't buy equipment you cannot reuse when starting technical diving
-Try to find some techbuddies. They don't bite, and in shallows most will dive with you and practise things.
-Talk to an instructor. Better if there is a techinstructor that has a group of buddies/friends for fundives. Then maybe you already get some extra tips and tricks for later and you know when you are ready.
-Go diving in all kind of different waters/places.
-There is a chance your interest in diving is gone before you became a techdiver. This can happen to everybody. It is not your fault, it is just being human.
-Don't forget to have fun when doing the recreational dives. Even if you have a technical cert, most dives will still be in the recreational depths and open water for most technical divers.