In this case yes, I would actually group Bibarel and Bidoof differently because thats how they are. I didn't suggest that for any other Pokemon, don't try and pretend you are in my head. Bidoof is caught around level 3 or 4 and you can use it as a quick Rock Smash HM Slave. If you are taking the time to evolve it, then you are wasting your time, since Bibarel comes literally an hour or less afterwards. I think grouping Bibarel and Bidoof differently makes sense because even though they share an evolutionary line, I don't think many at all would bother actually trying to evolve bidoof -.-.
<+kd24> tangerine, are ingame tiers made with the mindset of speedruns?
<&Mekkah> kd24 i like to think of them of efficient playing
<&Mekkah> efficiency basically means you go through the game quickly and reliably
<+Tangerine> what mekkah said
Torterra takes time, to use effectively. Yes it is effective but we are trying to go through the game quickly and reliably as Mekkah said. (I only pulled Flamethrower out of my ass, Fire Blast which can be bought at the store and Flare Blitz/Flame Wheel are both still viable options). Speedrun wasn't the right word because that is more of a contest to do things the fastest. But if I want to play quickly, I am not going to waste time with Turtwig when I have Infernape there for me. Turtwig is a nice second choice for a starter but there is no way he could be classed with Chimchar or Starly.
For the last point of "Torterra does better against Leaders/E4", maybe so, but Infernape and the rest of your team will probably go by just as fast if not faster. It is not and has never been a 1 Pokemon solo run. Last time I checked, we have 6 Pokemon to use in a team. I would rather just be switching in my teammates and using Infernape than trying to slowly level Torterra who just isn't as strong, just so I could have a more reliable gym killer.
I agree with you on the Bidoof/Bibarel argument, I often catch a Bidoof, never evolve it, then catch a seperate Bibarel, simply because Bidoof helps early on in the game, and you don't need a Bibarel until you can catch Bibarel.
I am still perplexed with your argument of Infernape > Torterra. Sure, you can move first, but, despite Torterra's low speed, it can often outspeed things as well(since it will most likely be atleast 5-10 levels above the other trainer's pokemon). I am not trying to persuade you that Torterra is the fastest, hardest hitting of the three-that would be ridiculous. However, many teams can play around with Torterra's defenses, and use faster pokemon like Jolteon, to make up for the speed issue. I beat my Platinum in ~14.5 hours using only Gyarados and Torterra, with the obvious HM slaves like Bibarel and Tropius. I had no problem at all, while I have also tried a run through with Infernape(and Empoleon, but I think everyone can agree he is the slowest as far as run-time is concerned) and Rotom-A, it just wasn't as effective. In short, I believe it comes down to personal opinion, but if you want to give Torterra an A-tier, go ahead, I will just have to eternally disagree with you.
As for "Torterra's moves coming later than others", this couldn't be more false. Turtwig obtains Razor Leaf at 13, meanwhile the comparatively powerful Flame Wheel is obtained by Monferno at 19. Starly gets Wing Attack earlier than both, but Turtwig isn't in last. Next, Staraptor obtains Close Combat(not STAB) at level 34(upon evolution), while Torterra learns Earthquake(similar coverage to Close Combat + STAB), and Infernape learns Close Combat(STAB) at 41. Finally, Infernape learns Flare Blitz at 57, Staraptor learns Brave Bird at 49, and Torterra learns Wood Hammer as early as 32, or Leaf Storm at 57 if you want to go that route. Either way, Torterra beats both in 2/3 of their typical moves.