This will all depend on what, exactly, your company does. ACADE lends itself well to schematic drawings and panel layouts, such as for industrial machinery, conveyor systems, etc. It is not meant for doing residential lighting layouts, PCB design, or testing/calculating/simulating circuits. ACADE keeps track of linked components, sharing catalog and other information across a project. It updates changes automatically, automatically generates terminal strips, offers reports on just about any scrap of data that it monitors, and like most ACAD-based products, also offers about a kizillion ways to customize, program, etc.
Also: If you're civil, and you're working with an electrical drafter, I can only assume you're either dealing in water/wastewater treatment, or some aspect of mining. If so, it could very well be that ACADE isn't a good fit for what you do. ( I did similar stuff in the civil field many moons ago)
As for your particular issue:
AutoCAD Electrical comes with several standard sets, each with its own symbol library. I would first insure that your designer is using the correct symbol set.
That being said, there is no actual 'official' standard in North America to which we must adhere. In Europe, things are usually governed by IEC standards. To that end, ACADE allows you to choose from the European standards, the antiquated, now-defunct JIC standard, and the NFPA-79 standard (which absorbed JIC decades ago, and which most people in the States use).
So when your designer says that the symbols aren't standard, I wonder what exactly he or she means. This is why I recommend checking the symbol set being used. (Changing it isn't hard, do a search on this forum to see how)
If this person is of the opinion that using a block library would be better, my assumption is that he/she resists change. Because while there IS a learning curve, ACADE is very competent and generally easy to use, for most things pertaining to electrical design for industrial applications. The tools and capabilities that it brings to the table make it better than using a basic cad program with some block libraries by far. It's just, drafting in ACADE isn't really like drafting in Vanilla ACAD -- you really can't use the commands you know, you have to learn the ones offered by Electrical. But IMHO, if you're anything like a decent ACAD drafter, the transition to ACADE isn't difficult at all, especially for someone who already has a background in electrical drafting.
Hope this helps,
Jim

Jim Seefeldt
Electrical Engineering Technician