One thing to note that you mentioned yourself @MichaelViera, is that there is an idea of 'social' and 'actual' rank. If you grind one map only, and get a 'perfect' WR on it - or something like that, your actual rank won't be so high, but most people will respect the grind you took to achieve this time.
However, there is also respect in putting in the time, to take WRs (tts/groups - whatever the goal is) on as many maps as possible.
If you personally think that a WR on one map is more respectable than top10 times on 50 maps, than you can think of the single WR player as better, but we might give the top10 player more points.
Someone who puts in time - not only time to get skilled enough to beat tiers, but also time to learn strats for new maps, grind each map, fight records on different maps - they deserve the overall rank one, or at least the higher points than a 'one-trick pony' even if they aren't so. If someone doesn't want to grind multiple maps but are good enough to do so, thats on them that they don't have a high rank. If they want the rank, grind all the maps. The point system doesn't favour players, just get a high rank on multiple maps, and dominate!
For new players, getting #10001 time is not going to effect their total rank so much anyway, so groups are a great solution to provide goals - overall incentivising them to increase their skill level (both in tier completion/speedrun), to eventually reach that WR-capable bracket.
At the end of the day, I think what you are arguing is that the concept of 'social' rank, should effect the actual rank. This absolutely shouldn't happen. We should reward players who put time in - for new players, this will be completing new maps, giving them a goal to reach that next bracket. For the top players, this is in fighting for WR/top10 on as many maps as possible. That takes alot of time - versus only being good at one map and fighting for it only.
Which person do you think deserves rank one out of those two players?
Because the system favors getting good times on as many maps as possible, for new players, their skill level in completing tiers is that cut off. If you can only complete t1, you can only get X amount of points. If you can beat t2 maps, you 'unlock' so to speak, X more maps (lets say double for the point of argument). As @Beetle179 said, there shouldn't be any point weight related to tier and I agree - the weight is that if you can beat higher tiers, you have more maps that are possible to grind. (Meaning you have the ability to gain more points than someone who cannot beat it.) Whether you grind all these maps you can beat is up to the player.
Ultimately the person who is the most diverse at speedrunning (in our game this will be in multiple gamemodes, multiple tiers, multiple play/grind styles) deserves rank 1.
If you want to grind some notoriously competitive map for the number one rank on it - then go ahead. People will respect you for it, however if your goal is to get rank one, then play the system. Everyone knows the point system, and if they want to learn about it, and see how to best use it to get points quickly, they can do so.