> effort to build increasingly complex applications in proprietary low code languages executable in a closed ecosystem (and commercial terms) of a specific vendor.

That's the definition of vendor lock-in. Once the vendor has it's hooks in your organization, good luck removing it. Sometimes it's just the cost of doing business, but the more the hooks, the greater the chance that a vendor triples or quintuples the cost of their product that affects your organization's secret sauce.

I feel like the goal of low-code solutions is to get you over the barrel. Much in the same way AWS tries to get into your company's operating costs.