Note that if your expiration date is on a Friday, usually the shares will still show in your account on Saturday morning, only to be assign later that day or on Sunday. Settlement occurs the following day, but apparently the buyer of your call gets a little extra time to watch the after-hours trading on Fridays.
With a volatile stock like Palantir, and a zero-commission broker, you could profitably trade in and out of the stock by getting your covered calls and short puts assigned, harvesting time value the whole way. The problem with either covered calls or short puts is they have limited upside and full downside. So if your stock goes up, you miss much of the gains, and if the stock goes down, you suffer much of the losses. If you just held the stock by itself, you get all the gains and all the losses which is at least a fair coin flip. The time value you collect is what is being offered to compensate you for the chance you miss out on gains while being exposed to all the downside risk.
In that sense, a covered call or short put is a bet that the stock will neither fall further than the premium you received from the sale of the option, plus the gap between current price and option price, nor rise further than that much. A CC or SP will be a better choice than holding the stock if the stock's price changes less than that much, and it will be a worse choice if a big move happens.
E.g. If the stock is $25 and I sell a covered call at the 25 strike for $1, I'll regret that decision if the stock goes up to $27. I held all the risk of the stock going down except for the $1 received, but instead of getting the full $2 gain in return I only got $1 out of it. I would have been better off holding the stock, because for almost the same risk I could have enjoyed $2 in gains instead of $1. Now if I want to re-enter the position, I have to pay more for the stock, which is like buying high and selling low.
E.g.2: It is the same calculation with a short put. If the stock is $25 and I sell a cash-secured put at the $25 strike for $1, I'll regret that decision if the stock rises farther than $1, because I just took on most of the risk for a smaller reward than I'd receive had I just bought the stock in the first place.