Ok let’s be clear: There is absolutely no restrictions to use vertical speed during climb by Airbus. As someone above said, just make sure your speed target is high to avoid your engine to spool down. Classic rookie mistake is to forget to wind up the speed before selecting vertical speed. My company has no restrictions to use vertical speed in climb cause there is no reason to unless you are a bot. They allow us to fly raw data where the workload is much higher so using vertical speed with AP is nothing. Only some weak crews don’t like it cause they don’t know the systems and are scared that the speed will drop too much LOL. Those are the same guys who never hand fly the planes cause of the QAR/FDM paranoia.
Just monitor your PFD and adjust your vertical speed accordingly. You are paid to do that and it’s not really an extra work load if you set a reasonable vertical speed you don’t even need to adjust it and you will reach your cruising altitude faster than CLB mode with CI 0 if you do it well. Very useful when you have a Cruise altitude requirement by ATC and you are heavy. Keeping a constant vertical speed makes also ATC happy as in CLB mode when vertical speed drop too much they think you are leveling off and might call your attention. Plus it gives you very accurate climb predictions if requested by atc. Eg climbing at 500 feet/min and 2000 feet to reach cruising altitude, then you know you will reach you cruising level in 4 min. Another bonus if you have a TCAS RA, and you failed to switch off both FDs; well guess what you are already in speed mode so you are safe! It’s a fantastic mode and it’s a shame that some pilots are reluctant to use it. If your airline does not authorize you to use vertical speed mode in climb then I feel sorry for you guys. All pilots using vertical mode on Airbus will acknowledge it’s useful and fun to use.
Peace.