It gets difficult to maintain or build skills once you are with most airlines. Most regional airlines are piloted by kids who really never learned how to fly instruments in the first place and the company and captain doesnt want them to turn off anything. It is easy to let the automation fly the plane and tell you where you are. The modern flight deck can lead to a real false sense of security. Sure a pilot might do several ILS's a day but in reality they haven't added much to their skills set. Flying a hands on approach doesn't mean much if the flight director is on. I am willing to bet that if you shut off all the magic on any typical regional flight deck you are probably less than three minutes from becoming inverted and crashing. However this doesn't prevent these people from getting jobs and staying employed. Therefore true instrument skills in my opinion are rapidly becoming a thing of the past.

And Like HSLD mentioned you will be forced to learn many different rules sets as you progress from company to company. Over time your mind will get scrambled with layers of regulations that come from all over the industry. The more you study can make it difficult to re-learn later with the next company. Though it is important to strive to become proficient at the regs it can be self defeating at times.

SKyHigh