But I wonder how friendly it is to non expert users.
Can't say from my own experience but browser extensions and IDE/Editor plugins seem to work well. If your customer is a business they might have developers to implement plugins.
Naturally it all depends on the type of product and type of customers. If your product is an online service then an API is your extension point.
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YeahKIA: You appear to be hellbanned, FYI.
YeahKIA's comment: Plugins is an interesting approach. But I wonder how friendly it is to non expert users. Same with the writing your own part.
Can't say from my own experience but browser extensions and IDE/Editor plugins seem to work well. If your customer is a business they might have developers to implement plugins.
Naturally it all depends on the type of product and type of customers. If your product is an online service then an API is your extension point.