This will be played at Spurs rather than Wembley - any ideas why?

It's been moved to the late May BH weekend - don't they play the football league play-off finals at Wembley around then ?

correct

And it won't look half empty like Wembley. We will probably fill it

But.....
they moved it from May originally because the comp was devalued by being so early in the year and the early rounds being some of the first matches of the season played...... (And rounds being played only a couple of weeks apart).
Don't understand this at all - regardless of where it is played.
For me, an end July final is preferable.

They've said it's a one off and will be going back to Wembley. I presume there's a quirk around the scheduling they can't get around, or that they had a binding contract with Tottenham over the World Cup game and they needed to either pay them or give them another game in compensation.

Really don't understand the "quirk" - sure, they might be legally obliged to play a game at Tottenham in 2022, but any future CC Final, if its going to be over the late May Bank Holiday Saturday will still clash with the EFL Play-Offs, and I can't imagine football taking a back seat to RL - unless the May BH Saturday date for the CC Final is flexible.

On the report i heard on radio it said some modifications were being done to Wembley stadium around the time of the CC final.

Great idea. Gives the CC a bit of a lift. Should imagine lots wanting to sample that stadium and a full house of 62000 would be brilliant. Hope we get there.

The challenge cup has lost its value.
They screwed it up when they allowed the top 8 round 6 entry.
You win 3 games to get to Wembley.

Get everyone in the comp in at round 1. No ifs or buts. Every team. Regardless of status comes in at round 1. That will throw some prestige back into the comp and truly have some giant killings and minnows having a big day out. Imagine the army vs saints wigan st Pat's vs wigan warriors. Wire vs woolston.