Things are different now, in fact way better, still if you are new and you want to DCA into Bitcoin, kindly consider getting a Trezor wallet at least, don't keep Bitcoin worth $2000, $10,000 on a software wallet, even if its a open source software wallet I believe this amount is too much for a software wallet, having this much means you can afford a hardware wallet.
Yes, that's right. I learned this from a bad experience I recently had, where my Electreum wallet was hacked and $750 was stolen after my computer was infected with a virus. If I had spent some of this money on buying a hardware wallet, I might have been safe now.
Therefore, for a person who is thinking about Bitcoin DCA in the long term, he should not be lazy to take security measures with great care, whether spending some money to buy a hardware wallet or securing his wallet with all the necessary protections, otherwise he will regret it later.