Speakers and television in the bathroom

Hi,
I wouldn't worry too much about moisture protection. Yes, moisture affects the lifespan, but if you don't plan to shower in the bathtub, meaning no splashes can reach it, the TV won't last long anyway due to feature obsolescence.
By the way, in my mind, a recessed "niche" where the TV sits would collect moisture rather than a simple surface-mounted practical wall bracket.
Alternative: No TV, but a monitor with a TV stick. You can watch everything anyway, and with pure monitors, there might be something with moisture protection at reasonably affordable prices. If you keep swapping the stick, the technical aging is somewhat circumvented.
I have posted floor plans here, but nothing involving the TV is planned yet.

Contrary to the drawing, the tub should be moved into the window corner. There is actually no space for a screen on the exterior wall either; I am now imagining a wall bracket on the right interior wall that allows a 90° swivel of the screen...

Had something like that planned too. It turned out an IPAD is sufficient.

@ Nemesis What exact mobile device did you buy? Specifically for damp rooms or outdoor use?

I pragmatically attached an LG TV to a mobile stand. I either roll it out to the outdoor whirlpool or into the bathroom by the tub. The volume while using the whirlpool should not be underestimated; at first, I simply turned the volume up loud to drown out the bubbling, but then there is just an exhausting overall volume, keep that in mind. I then switched to Bluetooth headphones relatively quickly; that is much more pleasant and relaxing...

Are TVs even pairable as audio output devices via Bluetooth with Bluetooth speakers?

Of course

We have installed invisible speakers in the bathroom (pursonic in the ceiling and in the sauna) and tactile transducers directly on the bathtub, so you can also hear underwater. I had also considered a TV but switched to a mobile solution (Microsoft Surface). This is connected via Bluetooth to my Gira radio to which the speakers are connected. The sound quality cannot be compared to normal high-end devices. However, the whirlpool and TV are really suboptimal since they are very loud.

I mounted a Panasonic 42“ 4K TV on the wall in the bathroom 4 years ago. Flexible, extremely stable, and long extendable mount. You can watch the TV everywhere in the tub, shower, or at the toilet. So far, the TV runs without any problems despite showering, bathing, and regular cleaning. Great picture, sound is good too. I was often worried about the moisture at the beginning. So far, no problem at all.