It's a matter of comfort adn the bikes natural geometry. I have evolved from gas to brake point with slight throttle through the turn to trail braking like a mad man. This just suits my bike, and is comfortable for me. I have found that the more brake I use, to a point, the better it turns in. That combined with what seems an over abundance of front end grip have moved me to using as much of that front grip as I can.
I would think that the newer more nimble(nervous to me
) bikes don't have as much ability to trail brake (can't really load the front up compared to a more stable bike), or the need to trail brake as much. A nimble bike puts more weight on the front tire, in general, that's one of the reasons they feel nimble. That's an oversimplification as there are many other things that cause a bike to turn in better, but in general, more weight on the front/bias the geometry to the front you get a bike that drops into corners and naturally loads the front tire. Thus you can not put as much braking load on the front as you lean it over.
I noticed this when riding Troys newer GSXR 750. I could shed speed faster during my braking and didn't feel as though I could trail brake as hard as I do on my bike. I reverted back to my older style, trying to be just ever so slightly on the gas through most of the turn. I was able to run quicker lap times on the new bike so the bike is going to drive how you use it to go fast.
Different turns will need different techniques. Hairpins generally are about getting the bike down to speed before apex and powering at or just before the apex. The high speed stuff has me on the gas much sooner, further from the apex.
This is just how I ride. I would think modern bikes are suited to less trail braking than I am used to, but I will let others add their comments. I ahve been wrong before :dunno: