tbh, for day-to-day, i dont think much difference especially normal users.

each have their pros and cons but im not a pro so what i learn is online so may be wrong.

3cyl allegedly is more efficient but will more wear and tear in each cylinders since fewer cylinders to boom boom. but i think most people are concerned about the nvh and the mounting.

modern 3cyl i only have experience with the ativa, people say that is horrible in nvh for me it's fine.

and imo its also a numbers thing; 3<4, so yes people will feel shortchanged. especially since until recently all of protons x&s cars are all 3cyl which seems like they double downed and are going all in on this.

havent test drive new x50, so idk la maybe it's alot better, maybe it's the same.

tldr; for everyday non-car users, meh. for car enjoyers yeah will feel shortchanged if recently bought x50 or s70 but unless there's a huge difference in reliability down the road, or in the nvh department, meh.