In this sentence: きっと、人生最後の日を前に思うのだろう 全部、全部言い足りなく **て** 惜しいけど

In translation, it is "unspeakably regrettable", but is it really? wouldnt
that be more like 言い足りないくらいに惜しい? or something? what does the て form do? If im
incorrect, why?

Also is it possible to include your own translation after? i would like to see
the difference.
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2023-05-04T15:58:56.333
99521
2023-05-04T15:58:56.333
55009
question
grammar
what does the て form mean here?