I'm not debating your note. It is very valid that we lack proper support for multimedia stack. I myself wrote a detailed rant on how broken it is  but three notes:
- Fixing something like this takes time, you need to assign the budget for it (which means it has to be done during the annual planning) and if gets approved, you need to start it with the fiscal year (meaning July 2022) and then hire (meaning, write JD, do recruitment, interview lots of people, get them hired) which can take from several months to years. Once they are hired, you need to onboard them and let them learn about our technical infrastructure which takes at least two good months. Software engineering is not magic, it takes time, blood and sweat. 
- Making another team focus on multimedia requires changes in planning, budget, OKR, etc. etc. Are we sure moving the focus of teams is a good idea? Most teams are already focusing on vital parts of wikimedia and changing the focus will turn this into a whack-a-mole game where we fix multimedia but now we have critical issues in security or performance.
- Voting Wishlist survey is a good band-aid in the meantime. To at least address the worst parts for now.
I don't understand your point tbh, either you think it's a good idea to make requests for improvements in multimedia in the wishlist survey or you think it's not. If you think it's not, then it's offtopic to this thread.
 There is a classic book in this topic called "The Mythical Man-month"