Well, you should.
You do all the job (calculating expected share price, events, modeling, etc.) and then just place a bet, that for you is enough to be winning bet (not that there is anything wrong with that).
The game is actually this- How much you pay per 1 delta and what is the risk you are prepared to take.
You already play this game (whether you recognize/admit that or not). Till now you paid full stock price per delta, but suddenly you want more delta for your buck and choose to buy options (and the risk attached to that). But since the option's delta is not a constant, there is a variety of positions with vastly different risk/reward ratio (delta being one of the important impacting elements).
What made me ask you initially about your choice is not the reward part, but actually the risk you took. And since you are well respected member here, others can follow and take the same risk without recognizing that they can get at least the same reward (provided the stock goes in the projected direction) with significantly less risk.
To repeat: Your argument is built on two things that I do not accept as premises. One, that delta, which is based on sigma, which is based on market activity (aka, consensus view), should be trusted uncritically - regardless of whether one does not agree with the market consensus on likely stock movement (something that applies to most people here). And two, that there exists a such thing as an "obviously better call", despite the existence of automated trading systems, which if true could just purchase said "obviously better calls" on options and write the "obviously worse calls".
If you have an issue with this, you should explain why:
1) You think we should trust sigma (and thus delta) despite not trusting the market consensus on likely stock movement
2) How "obviously better calls" and "obviously worse calls" would be expected to persist without automated trading systems exploiting them.
Delta is entirely unnecessary when one feels they have a good grasp on
specific likely market movement driven by
specific market news that will occur at a
specific known timepoint, but lower confidence outside that range. In such a case, options that expire shortly after said news have little time value; only (modeled) inherent value matters. Yes, longer-term options will also be affected by this news, but they also have time value affected by a sigma value for which one has low confidence. Why should I invest in variables that I have low confidence in?
In case you're curious, I actually expect volatility to drop after Q4. Not disappear, but be lower than Q4, and a lot lower than Q3 (back in Q2-Q3 I predicted lower volatility in Q4 than Q3, and it certainly looks like we're headed that way). The reasoning is simple: Tesla has been incredibly volatile due to two competing theses, whose adherents have been equally passionate about: the bullish thesis, which requires no repeating, and the bears' "Tesla is incinerating cash and is going to need to have an imminent capital raise (if they even can!) before being flooded by Tesla killers in the market place" thesis. Q3 being profitable was a serious blow to the latter. Two profitable quarters in a row will render it as fringe. People will still dispute the proper valuation and how the market will evolve, and there will continue to be both bulls and bears, but the polarization in the mainstream will not focus around such radically differing views ("Off to the moon!" vs. "Imminent bankruptcy").
If volatility is lower over 2019 than is currently assumed, then that lowers delta for long-term options. Which makes long-term options a worse investment.
But to reiterate: see the paragraph beginning with "Delta is entirely unecessary when...".