Fullstack 20+ years of xp here : There's a great deal of fun to be able to understand a system from top to bottom. It helps design robust and elegant solutions

Fullstack 20+ years of xp here : There's a great deal of fun to be able to understand a system from top to bottom. It helps design robust and elegant solutions. Yet, i do sometimes regret not having gone super deep in a field. However to me that would have meant do a Phd in that field and start a career as a researcher. If you stay at the "assembler" level (aka not inventing anything, just putting stuff together), then you'll have plenty of time to become good in multiple fields during your career.