Install all PHP Extensions?

Hello. I was wondering if it would be a good idea to install and enable all PHP extensions. We're in a position where a customer of our's is always asking for new PHP extensions to be installed and he's asking for all to be enabled. I would like thoughts from you all if this is a good idea. I guess an alternative could be installing a set list of extensions that are common and not have to worry about any further? I'd like some feedback on this.