It’s an issue that’s been going since at least the 2014 models (I’ve only seen 15” versions affected) but seems to be worse (much louder) on touchbar models - there are numerous YouTube clips demonstrating it for various models. Overall I don’t think you’re necessarily any worse off than you would have been buying any model since (at least) the 2014, and perhaps the chassis difference may have helped if Apple have been able to isolate what’s causing it... but it remains something to be aware of
Staingate updated to include 2017 models, so still very much an issue - nothing has been said about the 2018s having a different (I guess it would be billed as ‘improved anti-reflective coating’) anti glare coating, So assumption is they are still vulnerable:
https://www.macrumors.com/2017/11/17/apple-extends-free-staingate-repairs/
It does seem to be quite an uncommon fault, perhaps the higher volume of MBPs sold will spur more effort to find a solution - particularly if it’s Apple’s intention to make their own chips a larger and larger part of the Mac logic