There are a variety of techniques for latex balloon HAB flights that allow altitude control. Most of these techniques are applicable at any altitude—even as low as 50ft.
The earliest rubber balloon altitude control work that I'm aware of was a mechanical valve from the 1950s. They used the balloon's expanding size to open a valve and vent lift gas to stop the ascent and start a constant descent flight profile. More recent controlled attempts have mainly focused on electrically controlled vent valves or releasing/popping a tandem 'tow' balloon. For a brief overview see: https://swsdt.com/level_flight_with_latex_balloons/ Note, this article does not contain references to more recent tandem balloon work.
From my experience, slowing the ascent velocity from 5m/s to say 2 m/s greatly increases flight train stability. Slowing the ascent also increases the camera's time at altitude so more pictures/video can be captured. It is possible to achieve altitude control with latex balloons and doesn't require the use of zero or super pressure balloons. However, it adds complexity to the entire planning-launch-flight process not seen with up-and-burst flights, regardless of the altitude control method used.