I'm curious about your reasoning. Jira/Trello etc. are like $10/mo/seat, why bother rewriting them from scratch? You'll spend more in tokens doing so. Same for gmail/google calendar, what's the ROI? Those tools are reliable and cheap, why bother creating your own?

jira/trello: ergonomics. to set them up correctly exactly the way i want would take me 20 hours (or hire a PM), i can vibecode for 20h and get the same result.

plus, being able to crossref internal data types is chef's kiss.

im paying for claude pro so it's use it or lose it. when i finish everything and have it battle tested i can end my claude code. and anyways when i have 10 employees, it's parity.

for gsuite: i want to own everything internally eventually ans having internal xrefs will be nice. the gsuite data is incidental, what is truly valuable about gsuite is spam detection and the oauth capability