but the problem is that fastmail only offers mail and calendar, while gsuite offers, word processor, spreadsheet, presentations, online forms, and photos...
Fastmail has a photos/files/website feature so it isn't just email. I use G suite now for my side business and I've never used any of the features besides email since I have Office on my machine.
It obviously depends on your use case, your personal situation, etc. But for me it is very hard to justify $5 per user per month (we are 5 so that is $25), when I can pay $10 to Microsoft for Office 365 for 5 users, and get, besides email, chat, and drive, word, excel, powerpoint, and skype with 60 mins of international calls.
FREE PLAN - Up to five users. 5GB/User, 25MB attachment limit.
This is to have all 5 users in one "organization".
ZOHO offers full G-suite replacement, free. They have many more applications too.
I used the free plan for a few years, then started paying $24 per year for more storage. What you get for $24 per year is amazing. What you get with the free plan is amazing. Their business model is to impress you with their products enough for you move to a paying plan. They do NOT make money harvesting your personal information and selling it third-parties.