TPE and GWR definitely e-tickets (PDF straight to your emails and/or the option to show it in the app). Never used the SWR app but as it's First I'd presume the same.
I'm guessing the wording hasn't been updated as up until a year or so they only offered m-tickets, albeit they didn't need activating nor look like what most m-tickets look like (time at the top, moving with a background of colours).
I've done a test booking on a TPE service through TPE's website and yes, you're right. PDFs attached to the confirmation email. That's good news. Although it doesn't reflect well on these train companies that they can't be bothered to update their websites to accurately state something as critical to their business as how ticket purchases are fulfilled. Especially confusing is the confirmation email, which describes both the m-ticket and e-ticket formats in one paragraph!
"To receive your tickets you will need to download the TPExpress app, available from Apple or Google Play Store, then sign-in to My tickets within the app.Please
click here for information on how to download the application. You have chosen E Ticket, which means you are responsible for printing your own tickets. If you have not already printed your tickets, please open and print the attached PDF, containing all the tickets purchased in this order."
I've copied the above paragraph exactly. All typos are in the email.
Are we absolutely sure that
all ATOS-powered sites fulfil with the e-ticket format, despite the information on these websites describing the m-ticket format?