Does this 'and' construct make sense?

[Urs Liska]

I find

%% switch on debugging.
#(if (and #t (defined? 'set-debug-cell-accesses!))
  (set-debug-cell-accesses! 5000))

(found in init.ly)

strange.
Wouldn't it be better ot simply remove the 'and' construct?
#t evaluates to #t always, isn't it?

Or is this one more Scheme subtlety I don't get?

Best
Urs