In recent years the OS software has gotten very bad and Apple has done little to fix it. The UI is becoming disjointed and there are more crashing issues. The hardware is splitting between super high end and low end - there isn't much in between. For professionals, it's either spend $5,000 or more on a high end system (which is usually far more powerful than really needed), or go with a PC build for $1,500 which will do just as well. And Apple changing their core hardware isn't great either. They've done it several times over their whole history, but it seems to be happening more frequently. While some of the new hardware is technically (on paper) better, the changes take a toll on the coders and the quality of things suffer.