Riskable did not mean disposable

Were wartime landing craft effectively disposable because losses were so high?

No. Losses were expected, especially among lighter craft, but they were repeatedly reused and repaired whenever practicable.

Light craft such as LCAs were riskable and expected to suffer damage, but crews were still meant to bring them back when possible. Tank-carrying LCMs were even less disposable. British forces tended to repair and reuse damaged craft. American logistics could more readily discard damaged equipment and issue replacements.