Landing Pages with fully automated Conversion Funnels.
Multichannel traffic sources, email lists, automation triggers, analytics. Even small automation you add or a form field you remove, can have significant impact on your conversion rate.
Why leave things to luck when you can control all events on and off-page?
When you subscribe to an all-in-one conversion funnel, you get a lot of features that most business owners will never use but are there to make the package more costly. From the features that will eventually be used, some will be inefficient for different reasons. I'll give you some examples.
Lack of clean coding; Features breaking; No organic traffic
Those automated conversion funnels advertise that you don't need to be a developer to create pages abiding by modern standards, mobile-friendly, high-converting landing pages. The truth is that those pages are created with WYSIWYG software (drag-and-drop) full of coding errors produced from moving elements around with no hierarchy. A fact that makes them too heavy and too slow to claim any organic traffic, high rankings, etc., not to mention the lack of good content and frequent Google updates that demote pages. You will have to stick to running costly ads plus paying the monthly fee.
Other things that might not work are: Tracking pixels not capturing leads (skewed or missed analytics data); Navigation links producing 404 errors; Necessary scripts that won't embed; A/B testing not working; Non-responsive design with elements, columns, graphics, videos, crossing the borders on mobile screens; Redirects and webhooks not working, etc. Let alone the fact that you don't own the pages after you stop paying the fees.