Not really. If anything, it was more difficult to dominate then than it is now. In the 90s and early 2000s, the complexion of the races changed much more dramatically than they do now. A lot of cars would qualify up front, as in on the pole or top-five, and then fade. With Jeff Gordon, for instance, it was pretty common for him to not be good in the first 10 laps of a run, and then catch fire.
Then there's engine reliability. It was not uncommon in the era of Gordon's dominance for someone to blow the race wide open, and then blow up in the final quarter of the race. There were multiple years where Rusty Wallace would win more races than anyone else by a lot but never be a factor in the championship.
The way this car is, clean air is king and track position is so important. That's why I'm not "blown away" by Truex's dominance like most. That's what this car produces, especially with the horsepower reduction taking corner speed completely out of the equation in Monster Energy NASCAR Cup Series racing.
The basics are still the same. Gordon sealed the deal and won races and championships, Truex doesn't. Granted, I think he's a lock for this year's championship though.