Agreed.

The most important aspect of the pushrod/linkage type is how the entire system functions as a unit. You can use nyrods, and relatively small linkage parts, as long as they're well supported. If using the typical nyrod setup, just glue some small supports into the fuselage or wing to support the tubes at several points, and be sure it's rigid enough before you finish enclosing the fuselage or wing. (I recommend silicone rather than CA for this, because vibration or the occasional rough landing can break the CA loose. Silicone can take this and still hold on.

There's a lot of talk, some of it worth studying, concerning effects of temperature and humidity on certain linkages, and only you can decide how much precision you need. One thing I will say is that "hi-tech", expensive parts are not necessarily needed. Competitors tend to use these for several reasons, which not only include their real concerns, but also the idea that sometimes it's simply easier to "get the best and eliminate the worry". (and, I suppose many people simply use what is the most popular at the time) Just remember that before carbon fiber existed, all planes did not "fly badly". Often in modeling, a little thought, backed up with some good workmanship, is enough to produce competitive planes without breaking the bank.