Joel Spolsky has a famous post about this:

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A lot of software developers are seduced by the old “80/20” rule. It seems to make a lot of sense: 80% of the people use 20% of the features. So you convince yourself that you only need to implement 20% of the features, and you can still sell 80% as many copies.

Unfortunately, it’s never the same 20%. Everybody uses a different set of features.

https://www.joelonsoftware.com/2001/03/23/strategy-letter-iv...

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Also, there are many image editors _already_ out there of varying levels of power and ease of use. Some open source, some commercial.

And yet Photoshop still rules.