You are right, it does not prevent. But most people do follow the commit small and often principle. The important thing is that code gets as early visibility as possible and it is not hiding anywhere. In a loose and distributed team, the early pushes serve as an important way of communication - hey, my name is N.N. and I am working on this feature. Often, others step in and propose a better way to do it. In separate feature branch, it often happened that a guy worked months on conflicting/duplicate or badly implemented feature. Then senior developers noticed the problem too late. Then we were left with 2 bad options, accept bad merge to main or loose months of work. In both case, we have at least one angry and frustrated developer... Although we try to force people (esp. the newbies) to communicate their plans in Jira before they do single line of code. Another major problem was that earlier certain branches started to live their own lives, causing serious fragmentation of the code base.
I understand the importance of code visibility and this can easily be done with feature branches via a pull request that does not get completed until code is reviewed and accepted. Direct commits and push to development does not fix issues of poorly implemented code. A developer can easily lose months of work because they committed to their local development branch that tracks origin and then push all their work once. The issue here is that you now are faced with an issue where that code is now in development and you have no chance to deny or approve it. This results in higher need to roll back commits on your development branch as opposed to only accepting code that meets requirements.
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