Nothing here is dramatic. A form fills, and someone copies the details into the CRM. A campaign ends, and someone remembers to retire the list. An enquiry arrives on Saturday, and sales hears about it on Monday. Each task takes a few minutes, so nobody counts them. Together they take a large part of your marketing week, and they are the first things dropped when a launch gets busy. The gap is rarely effort. It is that the steps live in people's heads instead of in the system.
Why it persists. Each task is small enough to absorb. Automating it means stopping to decide what the rule actually is, and most teams have never written the rule down — they have only ever done the job. Marketing tools also make automation look like a five-minute switch, so it gets built in a hurry by whoever has the login, with no test, no owner and no record of what it does. The first time it misfires, trust goes, and the team quietly returns to doing it by hand.
If it stays unresolved. The manual load grows with every new channel, form and campaign, and it grows faster than your headcount. Marketing spend keeps rising while the team's output stays where it was. Meanwhile the records that sales and your reporting depend on get thinner, so the decisions taken from them get weaker.