Other species used faster than Warp technologies without issues and ended up with much faster (and more efficient) velocities than Warp alone.
A TW conduit threatened the Enterprise-D with structural collapse in the 24th century when it first encountered it... and yet the crew modified their shields and hull to cope better with the stresses inside the conduit upon secondary attempt and ended up fine on the other side.
Furthemore, when Voyager generated its own TW conduit using the TW coil they stole from the Borg sphere, they were perfectly fine.
In fact, the Delta Flyer used the thing for a while and its structural integrity and overall systems remained intact.
You cannot possibly tell me that Discovery after all its upgrades (or heck, even Booker's ship) cannot withstand being inside TW conduit with a certainty in the range of 99.99% or even 100%. What was SF doing for the past 810 years? Apparently, nothing.
The writers are intentionally making everything look impractical and dubming things down, because if they didn't and SF didn't need to use Warp, then their whole idea of the Burn and failure to find alternate methods of propulsion and power sources falls apart (like we know it easily does).
32nd century Federation technical understanding is really disappointing. It was essentially portrayed as incompetent.
The writers are taking well established technologies which worked perfectly fine and crews were able to adapt to them, and then turns around and says they are 'impractical' (mainly because their primary story wouldn't work otherwise).