Why exactly do people want random encounters to be around still? Why not like Earthbound style? I don't see what having random tall grass encounters adds to the game.
Also baffling Scorbunny is leading the poll and Grookey is last. The starters are not my favorite but at least Grookey is ok.
Multiple reasons, at least in my case. Random encounters have a "surprise" element that just isn't captured by having everything immediately visible on the field. Random encounters are just like presents; you never know what you'll get, whether it's something really good and rare, or something common, or in between, or whatever. Of course, people may disagree on that, and say you can still have that feeling with them visible on the field, and that's fine, but for me, random encounters work better for that and they just never bothered me.
Plus, for stuff like shiny hunting, I feel that having multiple Pokémon visible on the field all at once can easily work against you, as it's so, so easy to not pay attention and miss something, mistaking it as just a normal Pokémon or not seeing it at all with so much ground to cover and the shiny potentially being on any part of the map that's currently loaded. Like, that's something that happened to a streamer I watched: he was just chaining normal Shellder in the Seafoam Islands in Let's Go Pikachu, trying to get one with good IVs and stuff, when a shiny one happened to pass by on the screen. However, because he wasn't looking for it at all, it easily being mistaken for a Magikarp (which is also in the area) when not specifically looking for it, especially with the deep fog in Seafoam Islands water on top of it all, he didn't actually notice it until it despawned and its too late.
With random encounters, that kind of thing at least is never an issue because you only have to worry about the one Pokémon (Doubles Grass and the like aside) at the time, so much, much, much, lower chance of ever being in that kind of situation and having that kind of peace of mind, that I'm not missing something out of the corner of my eye or a different part of the field like what happened to Flare's shiny Shellder is another nice perk of random encounters for me.
Then another part of it was how, at least in Let's Go, on-field encounters were just kinda lifeless. As in, they don't really care about you, other Pokémon, other trainers, or anything. They just show up, run about a bit, and then eventually despawn. And all that is just kinda weird and just takes me out of it, just feeling so much like each Pokémon was isolated in its own little world or something. Now, granted, they could just easily improve on that and make wild Pokémon actually interact with each other a bit and scare each other off or chase each other down and stuff, or something like that. But that's obviously a lot more work to implement something like that, especially for each Pokémon, and so if it's specifically between the Let's Go implementation of visible overworld Pokémon encounters or having random encounters back, I'd personally take random encounters back just to avoid how off-putting and weird that is, especially combined with everything else.
And just more stuff like that. Like, there's other minor stuff, like how because of how Viridian Forest was implement in LGE/LGP and its high encounter rate, it's difficult to entirely avoid Pokémon in there at times without using Repels and if I'm going to be using Repels anyway, I just feel like the game might as well have random encounters at that point, but most of the rest is small stuff like that, at least for me.
In short though, it's definitely more a pro/con thing for me, very similar to discussions like whether or not Pokémon should keep turn-based battles (which I also think it should). Neither's inherently better or worse than the other and each just has certain strengths and weaknesses they each bring to the table, and so it's very easy to come down on either side depending on what combination of pros/cons appeals more to you personally. And for me, that combination of pros/cons leads me more on the side of random encounters, but yeah, that's just my take anyway.