How SaaS agencies help build sustainable growth systems instead of short-term marketing wins

I’ve been digging deeper into how SaaS companies actually scale beyond the early stage, and this overview helped connect a lot of dots for me: SaaSAgency
What really stood out is that modern SaaS agencies are no longer just focused on running ads or generating leads. Instead, they seem to work across the entire customer journey — from first touch to activation, retention, and even expansion. It’s a much more системный подход, where growth is treated like a continuous process rather than a set of isolated campaigns. Especially interesting is the emphasis on product-led growth, where the product itself becomes the main driver of acquisition and conversion. That means agencies need to understand user behavior, analytics, onboarding flows, and even UX decisions. In a way, they operate somewhere between marketing, product, and data teams, which is very different from how agencies used to work a few years ago.