60 hz is the lowest refresh rate on monitors now and there is not any standard lower than 60 hz, and also this refresh rate has been using for decades. You do not need to buy a game Laptop for high refresh rates. The are many regular laptops that have 72 or 90 hz.
Because of priorities. It really depends on what you need it for, and you have to prioritise, make compromises, etc. There are many reasons - power draw, price, etc. And "many regular laptops" have different priorities.
You do know that Pro Display XDR is also 60Hz? Do you think it's because they cheaped out? Or that there is a reason for it? Wacom Cintiq line - also 60Hz. Eizo ColorEdge monitors? You guessed it: 60Hz.
And here's the best one: Sony BVM-HX310 reference monitor.... you know, the one that costs 30,000 euros? Its maximum refresh rate is.... 60Hz. Now, this is literally the best monitor Sony can make, and made for studios who don't care about price. It's not like they decided to save a few bucks or something - it's just that you design around certain expectations and push the most important specs, depending on numerous factors. But whatever the reason, hopefully I've shown you that the best, most professional monitors on the market today are 60Hz, so I don't think "ancient technology" is the appropriate word.
For professional content, 60Hz is the standard. I'm sure no one would mind a 144hz screen on a MBP or XDR Pro Display (and I wouldn't be surprised if we get it at one point), but it's not that important for content creators.
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I agree that apple bills itself as a premium grade laptop yet are using components that don't really fit that premium designation.
What components are not premium on the new MBP 16"? Honest question. Because it's not the screen.