I regret using firstnamelastname.dev as my main personal account
It’s uncommon, and causes confusion if I have to dictate it out over the phone. You have to optimize for the non-technical people scheduling appointments that don’t realize there are options other than .com
I’ve started the process of migrating over to a .com with my middle initial added, and it’s so much easier knowing that everyone will understand the TLD. I imagine .net would be similar.
I've been self hosting a .net email domain for decades.
I don't really have the problem you're describing.
Depending on the recipient, I do sometimes reitterate the .net TLD, but that's it.
I would say a more significant issue would be having a custom domain name that's too long, as this increases the liklyhood that it will be misspelled.
Maybe my last paragraph was worded poorly - but I was trying to say that .net would also be fine.
.dev is absolutely a problem for non-technical people
.com, .net and .org are common TLDs, along with country ones