Not to rain on anyone’s parade but if you train solely for size/hypertrophy you certainly can swell up big time on gear. Problem is off cycle some gains will disappear if you don’t train heavy and low reps at all.
Let me say it another way. I’m a powerlifter, 3 reps is high reps for me [sort of]. Because of all the heavy lifting I do on cycle I keep my tendons and ligaments strong. Plus more of the muscle I add is from the lifting as opposed to extra water retention in the muscles.
I totally believe one reason gear users are more prone to muscle/tendon tears than non gear heads is on gear their muscles swell up but they don’t pay enough attention to ligaments and tendons. The strength imbalance makes their bodies more susceptible to injury.
Admittedly, if you don’t ever train heavy you can reduce your risk too; but who never, ever goes heavy?