I agree the trickle investing method is better, unfortunately it multiplies the fiat to crypto costs. For example I have to pay £10 SEPA fee to get my money to a foreign account of my crypto exchange, so this adds quite a % unless its a decent chunk of money. Of course there are ATMs or LocalBitcoins but the rates arent great.
But those costs are lower than losing your home...
Yes it's true, in a bull market like this, it's better to put in the money in bigger chunks to save on some of the losses in fiat, but over time, I think it's better to spread it out to be less emotional and more logical about it.
Indeed, emotions are the real danger