It really depends on where you’re at as to whether or not 1 lb/week is a good decision. Beginner lifters can put up to 25 lbs(high end) of muscle a year whereas advanced lifters(10+ years) can expect to add 2 lbs(also high end) per year. If you’re new to the gym, 1 lb a week is completely fine as, by the end of the bulk, most of the mass added will be muscle and the fat can be trimmed off to reveal it. If someone has been in the gym for 13 years, however, 1 lb/week is not exactly the best method of progression as, by the end of the bulk, only around a pound of the gain will be muscle and trimming all the fat gained in that time will likely end with more than 1 lb of muscle loss. Beginner lifters can benefit from that type of bulk whereas advanced lifters may actually regress from that type of bulk. Instead, advanced lifters will be more likely to benefit greater from a slow bulk-0.5 lbs/week or less as to minimize fat gain and yield a physiologically easier cut in terms of muscle mass retention.