Actually the lighter one joint exercise (flys, lateral raise, leg extensions, etc...usually extensions exercises) are done before a compound exercise, when doing the Pre-Exhause system. So doing a set of flys before the dips (or benches or inclines) is the idea. Theory being to "isolate" a specific muscle until it can not preform anymore rep's than quickly do a compound exercise to work that muscle even more. Dips bring in the triceps and delts to assist the pecs even more with their work load. The faster you do that compound movement after the "isolation" the better to take advantage of the Pre-Exhaustion on that muscle you may be target.
Can work very well with lateral raises and the Press Behind the neck (or even medium grip upright rows). Preacher curls followed by BB cheat curls work the biceps very, very strongly. Straight arm pullovers before pulldowns. A version that woks the back for me is straight arm pullovers followed right away with heavier bent arm pullovers. Must be dozens of combo that can be used when doing Pre-Exhause.
If some guy's would have Dips (with different hand positions) as the main chest exercise (not doing the BP at all), for 6 weeks or so, they may be surprised at the results achieved. Trick with the dips is not trying for the ultimate stretch at the bottom of the movement, not really needed. But many trainee's are programs to think that benches are the prime chest builder only. Or even have dips with-in a sound chest program if you can not do without the BP. Good Luck.