Am I the only one who thinks the 'full stack' marketing ignores middleware integration costs?

Hi everyone, I’m new here and have been reading a lot of the rebuild stories, which are honestly a bit intimidating. I’m coming from running a very small design studio (just me and two contractors), and I feel like I’m constantly wrestling with my "stack."

Lately, I’ve been seeing so many ads and articles for all-in-one platforms or "full stack" solutions that promise to replace five different tools. The promise is always about seamless integration and a single pane of glass. But whenever I look into them, I get this sinking feeling that the real work—and cost—is hidden in what they call "middleware" or "connectors."

For example, I currently use a separate invoicing tool, a simple bookkeeping app, and a different account for business banking. To even think about moving to one of these unified platforms, I’d have to:
* Export all my client and invoice data, hoping the fields map correctly.
* Figure out how to bring in my existing bank transactions, which never seems to be a simple click.
* Possibly lose some custom workflows I rely on, like how I track billable hours against specific projects before invoicing.

The marketing makes it sound like a weekend project, but my gut says it’s weeks of fiddling, data validation, and maybe even paying for a consultant to make sure my books don’t get messed up. And that’s before the subscription cost of the new platform itself!

So my question is, am I the only one who feels this way? In your rebuild stories, was the integration process actually smooth, or did you hit a lot of unexpected "middleware" snags that weren’t obvious at the start? I’d love some honest, unbiased perspectives from those who’ve been through it, especially at a small scale where every hour of setup is an hour not spent on client work.

I’m particularly curious about the expense management and invoicing side of things, as that’s where my current fragmentation hurts the most, but I’m scared of jumping into something that creates more problems than it solves 😅.