Why are mirrorless lenses so big?

Related questions

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4. What is MFT lens mount?
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6. What is a ED lens?
7. What is the difference between Four Thirds and Micro Four Thirds?
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Tags

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4. #decided
5. #things
6. #smaller
7. #glass
8. #feels
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10. #however
11. #shorter
12. #mounts
13. #point
14. #mirrorless
15. #their
16. #means
17. #easier
18. #better
19. #larger
20. #distances
21. #manage
22. #honestly
23. #correction