So carry a video adapter and a single USB adapter with you. Moving the dock would be plain stupid for that. Even with the previous retina MBPs, you had to carry display adapters around with you. Hell, even with the MBP machines before that you did too because you had DVI (or mini DVI) and the projector might be VGA or HDMI. It's like everyone here has never actually used a laptop before. This is basically par for the course across ALL brands unless your laptop happens to have the single port type that your projectors/displays all share which to be fair is finally starting to converge on HDMI, but is far from universal.
Same situation for me. Single cable at the desk, and don't need anything for meeting rooms as my company installed AppleTVs for all our conference rooms. But IF I didn't want to deal with the lag of presenting over wireless all I'd need was a single USB-C to HDMI connection. I used to need a TB/DP to VGA adaptor when I first got my 2012 as my company only had VGA connected projectors at the time. But as we know, professionals adapt, and so do companies.
People seem to neglect to realize that the USB-C connector isn't the port for the next 4-5 years. It's thee port for the next few decades (similiar to what USB-A has been). The difference is that this port ISN'T just for accessories and peripherals. This will be extended to monitors/TVs, phones, chargers. This is the be all end all port and I'm glad to have jumped in now.