What’s the benefit of going with a DevOps platform solution instead of separate tools?

I agree with Romano's comments. 

Additionally I would say that the benefits include, dependant upon your selected DevOps platform and your current pain points….

1) Reduce tool sprawl and align your engineers to a strategic, purpose built toolset
2) Avoid the cost, complexity and maintenance of integrating many tools together yourself
3) Retain the ability the selectively integrate with strategic toolsets that your enterprise wants to use  (e.g. Jira,     ServiceNow, Security inspection & validation, Secrets & Artefacts Management) 
4) Simplify onboarding of new joiners (to make them effective from day 1 via automation)
5) Improve security and quality by providing feedback much earlier in the dev process
6) Implement consistent controls via automated guardrails
7) Enable your engineers to experiment/adopt gen AI tooling 
8) Improve Developer Experience and productivity by providing modern, purpose built tools,   removing friction from the dev process and so create time/capacity to help them focus on   business issues and impact

Happy to talk off-line on this topic.

Typically, you’re using different tools for your CI/CD pipeline or your continuous delivery pipeline. When you have to maintain and integrate all of these separate tools, you usually end up with a complicated mess that’s hard to work and maintain. 

What you require is a platform that seamlessly integrates all the tools while maintaining loose coupling. It should be your one-stop shop that gives developers a great experience and helps their productivity. A DevOps platform is absolutely essential, in my opinion, for a fast time to market, fast productivity, better quality, and for standardization.