Telus stopped selling satellite service years ago (rebranded bell). Those who have Telus satellite are grandfathered in.
The login to various channels apps has been brought up many times. The answer is simple. Bell refuses to let Telus satellite customers use their login for the “apps” to watch live channels you already subscribe to.
While it’s not fair or right Telus has no control over it. Perhaps you can complain to the CRTC. Bell seems quite content not to allow access.
As for the Optik App it’s available to customers that subscribe to Optik TV only. It’s the same with any company with their own live tv app.
As mentioned, TELUS satellite is actually Bell just sold under the TELUS name and they do not offer it any more so why would they update or invest further in making changes? People using satellite are a captive audience, basically using satellite because thy have no other options. You may have noticed that satellite, once popular, is no longer so much and has applicability really only in the rural communities. You are not likely to get much better with another service. Shaw Direct, for example, continually increases its prices while dropping channels and not adding new ones.