100% agree. At $job - 2, we spent several days tracking a bug caused by s/$regex/$replace/ where $regex got accidentally empty and the substitution started replacing unrelated parts of the data.
Besides /b or a feature, another way would be to introduce a new construct, e.g. (*LAST), which you can use similarly to (*SKIP) etc.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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