For me, yes, because I have a Polk audio surround system running off a Sony receiver. I guess if I use the LG apps, I'd have to run an optical out cable from the TV. I've just never felt like fishing it through the wall, so everything just runs through the receiver; PS4, blu-ray and Roku. Also, FWIW, I really like the Roku interface.
Yep, I see what you're doing.
What I do is let the TV be the "input switcher", mainly because I currently am running a much older surround sound amp (TOTL in 2008 Yamaha) with only a 2.1 audio setup. I then let the receiver decode all surround sound formats and direct the rear/center to my main speakers via the receiver.
Then I run my optical audio output of the TV to the receiver.
I do it this way because the way I figure it, using the receiver adds another "link in the video signal chain" to everything. The TV can pass through DD and DTS to the receiver where it'll decode them per 2008 standards.
Since I only use my Roku to be a media server on my home network (I have about 12 TB of video on my network), I can then use the TV's built in apps for streaming YTTV/YT/etc. Now, I have done a comparison of the TV apps vs the Roku apps (say a Youtube TV vs Youtube Roku) and I seem to get more consistent quality using the TV apps (a 2018 Vizio Quantum) versus the Roku.
The PQ just seems to be a tad bit sharper no matter what quality video rate I'm streaming from 480i to 4k.
Logic tends to dictate that there should be no difference, but I kinda believe there is. Like I say, using my receiver and the input changer - it is another device all signals have to pass through. And being a former Sony snob with regards to their ES line back in the 2000's...Sony's sometimes are just plain finicky, which is why I switched to using Yamaha's (which have been trouble free for over a decade now).
Your mileage obviously may vary, and every rig is indeed different. But that's been my experience - less links in the A/V chain the better.