Why you don't understand "Internal" yet..

[xinyidizi]

You have defined a "style boundary" to restrict yourself before you even start your training.

It's not just about the techniques. Taiji teaches specific ways of shenfa, power generation, ... IMO that's the important feature of a style which is like the basic format of how your body moves and it takes a long time to achieve it. I don't think life is long enough to learn the essence of more than two or three distinct arts but this is different from techniques. After internalizing the basic concept, techniques can be added and modified from other arts.

Also I don't see anything wrong with having a direction or preference in the fighting style one wants to learn. Sometimes limitation is not a bad thing as it makes you work harder on a few things and gives you the opportunity to really learn using them which is better than learning bits and pieces of a thousand different things.