I haven't needed to contact support, but I think they have a manned tech support email address too.
Also, unfortunately Gmail/Gsuite is very cost-effective for us. We've looked at ProtonMail which seemed nice and potentially worth supporting but they would have cost us probably ten times or more what Gsuite costs (for email service only!) thanks to having to buy a ton of add-ons to get feature parity (they actually do charge extra for pretty much each custom domain and alias you want to use). And buying 100 GB of storage costs an eye-watering $120/month ($1.99 on Gsuite). I really don't know why their pricing is so weird. I know they can't probably scale as well on storage but adding aliases does not cause any measurable additional cost for them...
Anyway, if anyone decides to make a Gmail UI clone with a reasonable spam filter and pricing that's at most 2x what Google charges: Please let me know, I will migrate 120 new users to you within a couple weeks (not much on a grand scale but it's what I can offer...) :-)
The UI is much better than the gmail one, and the mobile apps are excellent. It supports tags or folders, depending on user preference (I prefer folders, so this is a huge advantage vs gmail.)
The spam filter is much better than gmail’s, at least for my account. Over the same corpus (my email went to both during a transition period), they both let zero spam through, but gmail was incorrectly blocking 10-30% of incoming email until I disabled its spam filter.
Plus you get an absolutely fantastic desktop app on Windows & Mac.
And for that you also get full Microsoft Office desktop apps included too.
Just get a domain like `Smith.com` and then use the email `John@Smith.com`. Then it doesn't matter if you're using Gmail, Fastmail, Protonmail, etc. You can switch to a different company whenever you want (to get the best rate, avoid abusive terms, bad service, etc) without having to update your business cards, websites, online accounts, etc.
You'll still need to have a way to back up your old messages though.
I used gmail with a custom domain for years before I finally decided to move to fastmail, which made the move pretty painless. That said, when I set it up gsuite with a custom domain was free. I don't think thats the case any more.