And we're back to the strawman.
It's not a strawman. The voter registration drives are hardly non-partisan in nature.
Where you run a registration drive matters enormously. A drive at an HBCU, a union hall, or a certain kind of music festival is almost certainly going to register more Democratic-leaning voters. A drive at a megachurch, a gun show, or a country music event skews Republican. Groups know this and choose locations accordingly. So even if no one says "vote Democrat/GOP" the strategic choice of venue does the work.
And certain politicians haven't been coy about it either.
House Vote #111 in 2019, in the United States Congress.
www.govtrack.us
Over half of democrats in the house said they wanted 16 year olds to vote.
The partisan effort is pretty transparent. Polling consistently shows that younger voters lean heavily Democratic, and 16/17 year olds are generally thought to lean even further left than 18-20 year olds, partly due to school environments and partly due to not yet having experienced things like property taxes, business ownership, or other factors that sometimes shift people to the right as they get older.
They are deliberately targeting lower information voters with these efforts
mitsloan.mit.edu
Not sure who remembers this one, but John Stossel went to a concert/voter registration drive, and decided to ask some of the freshly minted registered voters some questions in a piece for ABC news. Some of those kids didn't even know how many states there were, how many senators per state there are, what Roe v Wade is/was... simple stuff, and they were way off.
So what value is being added apart from "hey, they're young and impressionable, so they'll vote Democrat and help us win"
Last I checked, votes are not weapons - once again, your analogy falls flat.
Both are constitutional practices with a currently low barrier to entry.
Fine. But it's pretty clear that you don't think they should be voting, and - for the purposes of this discussion - that's a distinction without a difference. "They shouldn't be voting" is not a solution to the problem of low-information, disengaged voters.
My solution is more in the realm of "let's stop trying to actively encourage as many people as possible to do it simply because we think it'll help us in this election". If it's politically engaged people who are serious about it, they can figure out how to register to vote and will have the personal motivation to do so. Luring them over to a booth at a hippie music festival and encouraging to do it (because they demographically line up with people who typically vote your way) is knowingly watering down the institution for short term gain.