I think even if development at an instant is some % faster to start with, it writes the same functionality in more lines of code which will rapidly lead to a cumulative slowdown.

Imagine you are traveling the oregon trail in a wagon and a devil offers you an extra horse but all of its manure has to go into the wagon. Initial speed up followed by a cumulative slowdown. If you keep accepting devil’s deals as your wagon keeps slowing down to a crawl, the progression is governed by a horseshit version of Tsiolkovsky’s equation.