My masters program is in physics. I already have quite some research experience, but almost exclusively in the R&D department of two well known companies. Therefore neither my bachelor thesis nor my internship reports are publicly available.
I have one research paper I published with one of the companies during my internship that I can openly talk about and one related patent, but everything else is off limits. And this publication is not really just my work but the work of an entire department and has multiple authors.
I'm now thinking about doing my master thesis also at a company, but my (new) supervising professor warned me, that it might be bad for me not to be able to talk about the contents of my master/bachelor thesis when applying for a phd. He suggested to ask the company to allow me to split my thesis in a non-confidential and a confidential part, but that is not really feasible.
How serious of a concern is this? Do phd advisors really read the master theses of their applicants?