From what I've seen and experienced, one of the biggest hurdles is indeed integration – getting the expense management platform to seamlessly communicate with ERPs, HR systems, and banking apps. Another significant challenge is keeping up with regulatory compliance across different regions, which can be a nightmare to automate. I was reading recently that companies specialized in custom software development, like Softjourn, often highlight the need for platforms to evolve quickly to meet these demands. Also, user experience is huge; if it's not intuitive, employees won't use it correctly, leading to more work for finance teams.