Hey,
Being a loyal galaxy user, few suggestions
for the One Ui 3.x ::
1)-Optimised night charging (Somewhat like other brands are doing, very slow charging whole night and optimum charge in morning) so as to reduce battery wear and expect longer lasting.
2)-More camera pro settings and access to the M series as well. Also, single take feature on M30s.
3)-For and from all the M series users, samsung at least provide some more goodlock modules such as theme park, clock faces, etc.
4)-M30s being similar hardware configuration as M21 and M31, please provide One ui core 3.x (3.1 etc) to all in future updates.
5)-More privacy security to M series (non knox devices) with software updates.
6)-Paste option in the samsung keyboard for M series (These few things are at least basics.)
7)-Apps support for Windows 10 pc companion - Link to windows on M series.
8)-Remove ads from weather widget! Make Ui more personal and maintain the privacy.
9)-Twitter or social media feed on One Ui Home.
For the Samsung Gallery ::
1)- More optimisation in object eraser and also provide for M series.
2)-Better layer selection while editing in the gallery app, right now the layer selection is not optimum and useless.
3)-Resizing options fir photos resolutions.
4)-Option to revert AI auto function and retouching if needed.
5)-More options for better handeling the Cast feature to the tv or other devices.
6)-There is a slight lag while switching video to PiP mode aur getting back to normal mode.
Regards.