There shouldn't be performance issues with the complete works as I expect the acts are in separate files. I don't have any kepubs so I can't be sure but that's how plays are usually done.
You're right to be concerned about the availability of the introductions and the commentaries. I don't think the complete works have the individual articles. I'll have to check on that. (May not get to it until this evening.) I should have remembered that as I have multiple versions of some plays in order to read different commentary.
The other reason is that the way they edit/redact the plays can vary. For a long time, the versions of some of the plays that most people saw were the result of editors conflating different quarto and/or folio editions. They would create a mixture of their own that didn't actually exist in any editions. I read somewhere that the trend now was to be truer to a particular edition. I believe the RSC versions focus on the folio editions.
BTW, you can try downloading samples of the individual plays and see if you get all the pertinent parts of the frontmatter.
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