Why a bug reported more than 3 years ago in Twinmotion, be left as it is, and the devs not doing anything about it?

Thanks for letting me know. If you do notice the issue come up again, please submit the bug report and we can investigate further, as an acceleration like that should definitely not be happening.

Thanks for your feedback as well. I recommend submitting your feedback on our Public Roadmap here, as this is the best place to submit feedback for new feature requests or enhancements. If the developers feel that this is a feature that can be added, it will be added to the roadmap for active development.