SCH +WHM is the best combination for every 8 man raid right now and SCH can mainheal any 4 man just as well as a WHM. If your pet is dying or you're having problems healing on a SCH it's a personal problem, not a game problem. SCH is INTENDED to be much more difficult than WHM to play and a more challenging healer.
Really? 3-4 hours is too much for you? What are you working 10 jobs? Learn to manage tour time, or perhaps play a video game/video game genre that isn't well known for taking lots of time to get things done.
I know many many MANY people who work fulltime and have a family to take care of that can devote at least 5 hours twice a week to play a video game. sounds like you don't know what you're talking about.
Also, casual does not mean "bad player" and hardcore does not mean "pro player", I know many casual players who don't want easy, they want to be challenged and feel like they accomplished something. Casual means less time to play, hardcore means more time to play, right now you can play for 2 hours per day and get a relic done in a reasonable amount of time if you have skill or the motivation to learn. I know many players who play 24/7 and are hardcore who are HORRIBLE at the game, and casual players who don't play often and are amazing at their job(s).
Want to get your loot? Get better, don't ask for it to be nerfed because "b-b-b-b-ut I can't play 24/7 so I can't get this even though the fight only takes 1-2 hours at most!" There is nothing stopping you from getting all the gear in the game currently, it takes 8 runs of AK per week to cap out af+2, you can slowly work on a relic, and the only thing stopping you is a CHALLENGE, not 5 hour dungeons, not 10 hours of grinding, simply a challenge.
That doesn't mean casuals can't get it, it just means people can play the "but I'm a casual so this is too grindy for me and takes too long!" card, when in fact it's lack of skill holding them back, and not time.
Conclusion: Stop sucking and saying things need nerfed when you lack the skill. Get better.