although I'd add: efficiency.
Yes, but as you probably well know - this is a highly developed science now.
I'm sure you've heard of Cambridge Analytica... they are insolvent now (through legal action), but their acolytes have spread out across the world. There are Israeli, Russian, and other companies that will scrape every piece of data on the internet, to tell you exactly who to approach, what the most important issues are for them, what they ate for breakfast, and how they feel about their daughter's new boyfriend.
A strong grassroots campaign is predicated almost entirely on money.
Of course, you could have better vetting and training for the volunteers - producing a higher quality effort overall - but that's marginal. In the end, the quality of volunteers on both the Trump side and the Harris side will tend towards the mean.
What is most important is the maps you give these volunteers (where to go, and who to talk to, and what about). This is data, and data is extremely expensive.
The volunteer per diem, t-shirts, baseball caps, stickers, and other merch cost peanuts compared to what are the costs of high quality data.
It's highly useful, to know that user "AntV" frequently visits Catholic-oriented websites. Compared to other people in his area, he's 1.4X more likely to visit the website of the local diocese. Then, we also see that "AntV" is subscribed to the monthly Heritage or Cato Foundation newsletter. Now this is our man! Send somebody to see him from our pro-life PAC, and make sure he's ready to vote.