Your link speed at 433 Mbps is the lowest possible on the 5GHz band for 802.11ac. Right now my laptop is showing a link speed of 866 Mbps - I'm sitting about 3 metres away from one of the BT discs making a mesh back to my SH2. So, it's possible that by changing your router position and/or installing some mesh devices that you could get a higher link speed.
However, that's not really the most significant point, as you will never see downloads running at the maximum link speed. As an example, my download speed on fast.com is currently showing as 230 Mbps. The best download I've seen on my WiFi is around 360 Mbps, and that's at a desk that's about 2m away from the BT SH2. On a wired connection I get a solid 920 Mbps download.
To be completely honest, I can't see any difference in day to day use between the 230 Mbps I get sitting here in the kitchen vs the 920 Mbps I can get at my home office desk with wired connection giving me 920 Mbps - unless, obviously, I'm downloading very large files (and even then I sometimes can't be bothered moving to the wired connection, and just go and make a cup of tea while the download progresses).
