Bro, not all people will complete all the derby tasks diligently, easy tasks are done first and upgrade tasks are done at the final day. For all F2Ps, Patience is the weapon 

Save these tasks till the end to upgrade 1 item from 1-7, task finished. 

It's not an issue for me. I did state that I held off in my OP. However, it can be for many. Day 5 is upgrade 10 times. 

There are a lot of other problems which players complain for years and aren't fixed till now than this "insignificant" (no offense) Event Objective completion 

1. POOR MATCHMAKING:  Though the devs say that they are working on to improve matchmaking and try to provide players a fair game, but till date the problems are not fixed. Sometimes we find the match quite easy but most of the times it's heavily rigged and players get matched against very tough opponents. I have posted a solution on the title "SUGGESTION TO IMPROVE MATCHMAKING" (which might take a few months if the developers REALLY wanted to fix that issue; but many, including me, clearly know such solutions are never gonna get implemented)
2. DUE COMPENSATION AFTER REBALANCE: A thing which is still not given to players who had invested a lot of resources into the game, but after a single nerf the particular mech/weapon becomes less competitive. Though rebalance nerfs are done to ensure a fair game, I agree. But it's not fair to nerf a mech/weapon and then promote another newly released mech/weapon which has very powerful stats and then nerfing them again because it "ruins" the game due to overpowering stats, abilities, etc... If players are encouraged to spend, then they also have the right to claim back their resources if it's no use for them (The player can just return the mech/weapon and get back all their invested resources and that returned mech/weapon should be bought again if the player wants them)
3. BLUEPRINT SCAM: I don't know how many people face this problem. But somehow, my maxed up Lancer STILL receives blueprints. What can I do with them. It's of no use and still they give Lancer blueprints. Just give blueprints for any other mech or weapon OR give us a 'scrap' feature where we would scrap blueprints for Credits, A-Coins, Mod Parts, etc...

Even if such problems exist, the game community seems to "ignore" all these issues, and the worst part is that not many players would give their support. If we players stay united and tell our in-game problems, the devs would surely respond. I appreciate the hardwork the developers might put into the game, but recently the effort has been reduced significantly. Hope the developers understand our situation and fix all the listed issue as sson as possible

I might have left any problems, and these are the three biggest problems (according to me). Feel free to add more because there are many other issues I might have forgotten or might have overlooked.

The upgrade mechs or weapons 10x is the one that's unnecessary and evil. I can understand the upgrade 7x, the rest just feel like a middle finger in the face.