I see this in the NBA, in the rare times I turn their games on. Unnecessary in my opinion.

Right, Kitts. He was at Nebraska (vs. Wisconsin) last night. If he's not the Big Ten top dog, he's right up there.

Telling the new lead to get the hell to the other baseline.
Under 2 minutes in the 4th and in overtime they have to chop the clock or a start of a count.
or
Signal they have last shot.

The point, at least in the NBA, has nothing to do with a timing issue or telling the new lead to get to the other base line and Welpe isn't referring to the signal officials give to indicate last second shot responsibilities. You tend to see the point that Welpe is referring to whenever there's contact that wasn't deemed illegal by the official and I guess the point is a kind of "play-on" signal.

Should also point out that under NBA rules the clock stops on made shots with a minute or less on the clock in the first three quarters and the final two minutes of the fourth quarter/any overtime period. The clock stops on a made basket in the final minute of the second half and any OT period under NCAA rules.

Under 1 minute in the second half. Sounds like you're talking about some crappy professional league where they play music during live balls and people dance in the aisles rather than watching the game.

This...although I've seen the point the other way with no contact on an uncontested layup in the middle of the first half. Maybe he is just telling the players time to go the other way now.

If NCAA is the same as NFHS, I saw the replay and thought the thrower kept at least one foot over the 3' DS.

That mechanic is in the same book as the "get up" mechanic & the "play on" mechanic.

So in other words, soccer signals are invading NCAA D1?

That's what I thought while watching it.

My thoughts
 

IMO using approved signals/mechanics for the level one is currently working is one thing.
Signals used for non-verbal communication is another.

The game is about communication now more than ever & if we cant talk during live ball other things can be done to let one know that we heard them.

I dont care for the "get up" too much because thats telling a player what to do, but the "he's vertical, nothing there" the "directional play on point" the "no travel, he bobbled it" & the "it's a block" (clapping hands up & down after the play NOT the tipping signal during the play) are all great non-verbal communication tools! It's the same as when we nod our heads or give a thumbs up signal to coaches/players. Some things need to be addressed immediately or we'll have to sling Ts around... not that we are afraid to do that, but if we can avoid it by giving a gesture to answer a concern during live play why not do so??

I use each of those tools in the games work, yes, including HS games & it works for me. I've been told during & after games that my willingness to listen & respond is much appreciated.