Can I use Outreach as CRM?

I've been using Pipedrive as a CRM and Yesware as a Sales engagement platform. I'm not super happy with this system because the integration between the 2 is not great and I end up doing a lot of stuff manually.

I've used Outreach before and I loved it, so I was thinking of ditching both Pipedrive and Yesware and using it as a solo platform to do everything. I've read in a few places people saying that Outreach needs a separate CRM system but I've seen that they have integrated deal management in the platform.

I was wondering if anyone has experience with using it without a CRM?