How do you do financial planning and would you use a software for it?

Hey guys.

I'm eyeing building a financial / operational planning software tool for startups that makes Excel fairly obsolete and would like to get feedback / opinion on couple things.

My impression is that pretty much every SaaS / ecommerce / younameit startup is using Excel for any financial forecasting, budgeting, operational planning. You build a simple or advanced Excel model. You use this model internally and use it also for fundraising when you reach to VCs or other investors.

How do you do financial forecasting? How difficult is it for you?
Do you feel comfortable with Excel or hate it?
Do you use any other tools?
Do you find annoying manually exporting Shopify etc. data and plugging into your model?
What are you biggest annoyances in the analytics / planning process and what would you love to be improved or taken off your back?

Thanks