This is because you hired developers on payroll and it would be a dumb strategic move to fire everyone once the product is "finished." You have to keep building things in order to justify having people on payroll (otherwise you're paying them to do nothing every day).
If you take VC funding you're in for another world of pain, which is that your company may be perfectly profitable but if it isn't growing at a rate your investors want you'll get kicked out and replaced by someone who will take "product growth" seriously. In other words, Postman needs more paying customers so it needs to become more of a "one size fits all" tool.
One might think that the solution is to simply work on another product after Postman was declared "done," but it seems like nobody seriously attempts this anymore because the SaaS model is so much more profitable.
If you take VC funding you're in for another world of pain, which is that your company may be perfectly profitable but if it isn't growing at a rate your investors want you'll get kicked out and replaced by someone who will take "product growth" seriously. In other words, Postman needs more paying customers so it needs to become more of a "one size fits all" tool.
One might think that the solution is to simply work on another product after Postman was declared "done," but it seems like nobody seriously attempts this anymore because the SaaS model is so much more profitable.