We replied to your other thread regarding support here but to address other comments here -
Are these themes from themeforest or via envato elements?
Themes are checked and 99.9% they don’t contain malicious code.
Themes may appear bloated (although a lot of authors do a great job of minimising this) initially because the scale, quantity and quality of features, functionality and options made available to buyers (not something you get with free themes, hence they may, at first glance, feel less bloated). Themes are not intended to be used as is and out of the box. Buyers will want to personalise and edit to their needs, which is a process that includes picking and choosing which features they want to use and removing (whereby de-bloating) others.
In terms of the header, then the level of flexibility and process to do this will differ between themes (envato do not make these themes, it is individual authors so there is not one singular way) BUT numerous themes offer the ability to adjust headers in the theme options or builders, and for those without this functionality it will be achievable through editing the code (which presumably is what would be required with any of the free themes referenced above).
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What specific themes are you referring to?
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What changes are you trying to make?
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Can you share a screenshot of the things “in the docs which are not in the admin”
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so we can understand the difference, can you share an example of another theme that you know of that has a header which is different and easily editable?
With respect, if all of envato’s themes were poorly created and no better than free themes then they would not be the biggest marketplace in the world. We’ve personally purchased into the thousands of items and only had issues with less than 10 of those.
Obviously it’s not good that you are having a bad experience but the fact that despite hundreds of thousands of buyers on envato using the themes, you have had issues with every one of the first few that you have tried would suggest that perhaps the issue may be something else and that there may well be a solution.