I should add, in my view, part of the 'obsession' with speed is down to marketing - how the provider can make more money out of you by distinguish different prices for different packages.
The only (main) differentiator they can have for broadband is speed - unless they limited the number of devices connected or what you can do with it in some other way, even an amount of data (which is what the mobile operators do). It's on, right? Limit time periods it's available for different prices?
Customers get convinced they need an upgrade and it will be better - that depends what you want to do with the bandwidth - you will always be limited by other factors like a wireless connection or device capability.
How big is the household? What is your usage. Several teenagers in the house all gaming and downloading? What do you do on the web? Lots of uploading of photos and media (one of my relatives is an estate agent and does a lot of that)? We only upgraded to VM 200, then 250 from BT 20mbs so we could get UHD TV and watch TV on more than one device. Otherwise not really needed.
I remember a little old lady being up sold an upgrade to a faster broadband package - all she did was read a few emails from relatives each week and the parish newsletter once a month from the vicar - fast broadband totally unnecessary.
Something to think about....
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I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!