But I think you are missing a vital item. Where is the cup of tea / soft drink?
Only people scared due to the internet being full of death/doom mongers have a thing about uncased CRT displays... Go back to only ten to fifteen years ago, and most TV shops that carried out repairs would have had many sets running on soak test with most of their cases / covers not fitted
No different to having an internal combustion engine running while not housed in a chassis.
Safe as long as you are not stupid or silly enough to put your bits in harms way
[PS I may be more than a bit biased, as in my job, a lot of the time we work on live electrical systems].