integration is likely the most valuable part of the puzzle, but it's also prone to disruption
I think all that's left are like <50 apps each with their own very bespoke and "power user"-ready interface
Or you can just ask your LLM to install https://github.com/CollaboraOnline/online
Between open source, LLMs, and SaaS vendors getting greedy and privacy invasive, the total pain minimization calc might shift for some orgs.
"We have this awesome internal version of Docs that we're responsible for fixing, upgrading, and doing support for" is not the flex "AI can code anything!" aficionados think it is. Especially when you also have similar internal versions of Sheets, Jira, Slack, GitHub, Linux, Postgres, and 100 other tools.
Making your own Google Docs is stupid unless your company's core business is document management.
OTOH Replacing SAP with a bespoke system will make a lot of sense for many companies.
SAP is already the worst of both worlds. It'll have been highly customized for your flow so you've got all of the headaches of bespoke software and all of the headaches of SaaS. And unlike Google Docs, it'll be highly integral to your core business.
I would absolutely NEVER steal or rewrite that. So much finanical stuff is baked into the business logic that impacts finance, regulations, hr, etc.
No do not roll your own ERP core.
Roll everything else