Cause that quad core trades blows with AMD 6 core 5000 series parts at lower consumption.
5600G is a mobile part retrofitted for desktop, with reduced cache, bandwidth and other compromises that make a lot of sense in a laptop, much less on a desktop.
Realistically, the Vermeer-based Ryzen 5 5600X is the closest price-comparison for this quad-core i3 and even the cheaper 5600 (non-X) is significantly faster than this i3 at a paltry $120 - arguably the best performance/$ processor on the market right now.
The 5600X, for the same price as this 14100 will game, render, encode, simulate, and emulate so much better than this i3 it's not even really a comparison, it's a total bloodbath. The i3 has an IGP the 5600X doesn't have, but it's (as reviewed) damn near worthless unless your needs are so low a decade-old netbook would satisfy your requirements.
If you truly need a processor with an IGP for $150, then it's kind of okay, which is why I said I don't hate it - but the LGA1700 is on life support, retirement is imminent, and the AM5-based 8500G is the same price on a much more desirable platform with better CPU and IGP performance as well as fantastic low power consumption. In this scenario, the 14100 is inferior in every possibly metric, but it's still a reasonable option if you have a spare LGA1700 motherboard lying around and need to fashion a casual-use PC out of it.
Either the application suite changed or recent updates have reduced Raptor Lake performance.
Likely a little of column A, and a little of column B.