Sometimes I have text with different sizes inside the same text box and it's quite common that I need to resize the text, proportionally, but using the Transform Tool is not ideal, because it resizes the text box itself, which is not always the goal.
Someone suggested a "solution" here (https://community.adobe.com/t5/photoshop-ecosystem-discussions/change-text-size-without-transform-to...), but there's an issue with using a shortcut to add X amount of points. All text will be added X amount of point, but that is not how percentage works, so it will not keep the relationship betwen the different text sizes. Example:
Title at 50pts
Sub title at 25pts
Title is double the size of Sub title
Adding 50pts to each:
Title is now at 100pts
Sub title is now at 75pts, which is not half of Title.