You can always touch & hold a message, & select “Copy” to export an individual message. You can also screen shot your messages, or simply view them in the app.
How does not allowing batch export of sms messages to other apps stop you from accessing them?
Batch exporting text messages is an wholly different thing from simply accessing them. The only confusion about the meaning of the word “access” seems to be on your end. You appear to intend it to mean something like “having all the features that I personally want in order to best facilitate the activities I desire to do with the highest priority, disregarding the popular use cases entirely” which frankly is an insane definition of the word “access”, and deserves probably a much harsher tone than it’s been given thus far. The fact that you still appear to be standing by it as a serious definition is even more shocking.