(for me) Sometimes your job might make you run reference time for a large service provider... and then you need multiple reference signals... and then you realize you have spares that are going to be thrown away... and suddenly your home lab becomes way too geeky for you to admit to 99.999999989% of your friends... unless they also are on the same time email list as you ;)
I'd debate that the custom LCD buttons made the difference... I've got a few macro keypads for some specific use cases, I ended up with a elgato for a -very- niche radio related use case and love it
I have a 3 character .com as my primary email... it gets rejected more often than I'd like... including at my bank :) I've got a longer more normal domain that I alias, but it annoys me none the less.
MX->A->PTR->A->MX
SPF
DKIM
DMARC
mta-sts - DNS and webpage
Also your IPs must be squeaky bum clean, ideally for several years. DNSSEC might help too. In the UK getting as far as DKIM is usually enough (plus clean IPs, even FTTC connections will work if static).
Raised with my grandmother with Alzheimer for all of my childhood she called me by her long dead brother's name.
Walked out the door one day said "See you later grandma" and she said "Have fun ______" and called me by my real name, called my older siblings and said go spend time, she died two days later.
Its one of the books I include in my 'desk library' at the office.. I'm an old graybeard, but it's an amazing book for folks to understand the joy and shortcommings and pressures a project can put on you
I hoovered up all the hardcover copies I could and for many years gave them as gifts to my teammates after our projects shipped. Mostly as thanks for a job well done, and just a tiny bit as an apology for what they'd just been through.
Did your team work similar jobs as described in the book? That must be fantastic! Yeah I know most of work is 80% chore, but at least the other 20% part is fantastic.