Expressing is very much the worst of both worlds. Much harder work than either option, and minus many of the benefits of breastfeeding: less skin to skin, less beneficial microbial transfer, and you aren't making use of the live-feedback nature of breastfeeding.
I recommend either breastfeed or use formula, or do a mix of both... but honestly do not bother expressing.
I'm a big fan of breastfeeding but I do believe most of the benefits are from the skin to skin, active antibodies and live-feedback (the way your breastmilk adapts to the time of day, temperature, and whether your child is ill). You get none of that expressing and the antibodies degrade in the fridge/freezer.
When you express, it's a cold machine and pinching and uncomfortable. You have to do it at all hours and it's time consuming and always has a disappointing yield. I hated doing it when I went back to work.
Everyone I know, without exception, who started expressing regularly, quit breastfeeding altogether within a couple of months. Those I know who did mix feeding carried on for years, as I did.
Your dh has no idea what he's talking about but he is right (for the wrong reason) imo.