How's this being quantified?
Not discounting it or looking to argue, but how is it "much better" than a 70, a T3 or a 700?
If you want a rifle under 3000$ you have to cut costs somewhere. Different companies cut in different places, or cut more than others. In this case Browning has less cost cutting than Tikka (and there is additional savings because of the currencies involved).
With the Tikka T3 you pay for a Sako barrel and a Sako trigger, and the rest is for saving money, that's simply how the approx 1000$ price is allocated. The action design, although manufactured to very high standard, is the most basic level of action design, it brings rounds in and out of the chamber and that's about it. It is one size fits all, has a basic safety, that dovetailed bolt handle, and has little to no provision to protect the shooter in case of accident.
The X-Bolt action design has scaled options, involves more machining, has a better, more expensive safety, a short bolt throw/lift, and has good gas venting measures. The rest of the rifle follows the same idea.
Now, the arrival of the T3x has leveled the playing field, before that the X-Bolt was clearly a step above. Similarly, the post-64 model 70 and the 700 are very basic action designs, the X-Bolt action design is more on the level of the Sako 75.
If a rifle cuts costs where you don't care, or don't notice, then great, that's the one you should buy. Some shooters give more importance to different things.