The problem with implementing this idea is it’s based on the false premise, “The devs want everyone to finish everything”.
They don’t. They want to frustrate you. It’s their job. They need you to feel like you can almost get what you want out of GoW, but if you’d just buy a few gems you’d get everything you want. Every week. To get there, they need to make sure that to be competitive you have to spend more resources, because players today have better opportunities to farm than they had before.
The economy isn’t based solely what the average guild does. The devs also have to keep in mind what guilds like Anonymous and TUF are generating in terms of income every week. Most of the game’s top guilds might be agitated, but they’ll still spend what they usually spend and still get multiple LTs.
Right now it costs 30 players an average of ~1.6 million gold to complete all tasks and start LTs. It would take 35 players an average of 1.4m, which means if they donate at the same level as before they get 200k * 35 players = 7 LTs out of those +5 players. Meanwhile, if you’re in a lower guild averaging only 700k per player, you go from 21m (not even halfway) to 24.5m (still not even halfway). And if your guild is donating less than that, you get even less. A guild donating 700k needs ~70 players to reach LTs. A guild donating 1.6m per player would get 60 LTs out of 70 players. Or they could drop their average donation to 1m per player and still get 20 LTs. 1m per week is very sustainable if you play frequently.
So while this would make it a little easier for lower-ranked guilds to get more tasks completed, it’d disproportionately reward the higher-ranked players.