I've had a Yamaha
ysp-800 for around 15 years. It's been shelf mounted and wall mounted with various tvs, and has been configured to give decent surround sound (when in a room this suited) and permanently in stereo mode (when the room shape was too odd for it to bounce the sound about the place) The 'auto set-up' function with the included microphone is very good, and when I bought it I had no idea how useful that microphone would be for doing zoom quizes with the family.
The sound from any tv without it is very thin to my ears, tv speakers always sound like they are there just so the tv works, but they're like the tiny ink cartridges you get with a printer - you're not expected to use them really - it's just so the manufacturer can say it works out the box.
Personally I'd try and get a decent soundbar and keep hold of it rather than a cheap one. Mine doesn't have HDMI throughput or anything because it's so old, but it's still fine - the various 'boxes' (Freeview recorder, NOW tv, Bluray player) send the picture and sound to the tv via HDMI and the tv passes the sound digitally to the soundbar via a very thin and discrete optical cable - the don't go obsolete.
Ours has various settings that may help with dialogue - when things are in stereo (i.e. most things broadcast) I put it in stereo mode so the sound is coming straight out of it. In the surround modes is sends sound off at all sorts of angles with appropriate tiny delays so it arrives at your ears in a way that makes you think there are speakers all around you, but when you're watching Pointless it just makes it harder to hear the talking. That said some of the virtual effects are good - I tend to use 'sport' mode for, er, sport as it does quite a good job of focussing the sound of the commentary straight ahead but making the crowd noise sound enveloping.
EDIT - it also has 'Target' mode where you can set it to 'aim' the sound at a particular point, so if you're a bit mutton and the other half is not, and you have your own parts of the sofa, you could set it up to aim the sound at your end :-)