Built on a single idea: you should not be allowed to make an ugly slide. Every layout is a smart template that reflows as you add content, so a fourth bullet or a second image rebalances the slide instead of overflowing it. Brand colours, fonts and logos are set once and enforced everywhere, which is why it lands well with teams whose decks currently look like eight different companies.
The constraint is the point and also the complaint: if you want a slide laid out a particular way and the system disagrees, the system usually wins. Designers find that maddening and everyone else finds it a relief. For a team that needs consistently professional decks without a designer reviewing each one, it is the most reliable pick here.