I concur, it's good to have it aligned as good as one can get it. If you can't get the engine to move, and can live with the alignment as is, I wouldn't take it into a shop to have them do it. I think the biggest point is you should check it, and try to improve it if it's out. If you can get it to .002 or less, you should.

When I aligned mine after replacing the strut bushings, it was WAY out - the couplers were offset concetricallyby at least 1/8". I'm surprised I didn't notice any vibrations. So, yeh, the system is forgiving, but for how long? Metal fatigue will set in, and, invaribly cause issues in the future - so I can safely say I am very glad I got mine aligned.

I just think it's good practice to check it, and improve it if you can. At the end of the day it's your boat, and your investmet, so you gotta live with it!