This fear usually affects two groups of people: 

App companies with previous (negative) SEO experience and those who are clueless about ASO. 

If an app company received a penalty from Google in the past, it is understandable for them to worry about ASO.  There is fear that the same thing will happen to the app for any changes made. 

However, there is no reason to get stressed. In reality, after any change you make ASO wise, it is very easy to revert back to how it was before if you change your mind. 

For app companies that are clueless about ASO, they might also worry about making changes. 

Remember, ASO is not a one-time, big-time change. It is a series of small incremental changes, and between each change, you need to analyze why it did and did not work. 

You can list down all your different ASO strategies and schedule their implementation whenever your app has an update. 

I recommend updating your app every two weeks to allow you to observe if your ASO techniques are working or not. 

Take note that too many changes might have negative effects on your app as well. 

Changing the name, title, subtitles can confuse your users. 

You can always change the metadata, optimise your screenshots, and improve descriptions. 

So don’t fear making any ASO changes. There is no need to stress yourself out.