There is always a need to remove machining marks from wood components...saw blade scratches, planer/jointer knife marks, etc. How you do it is up to you. In some cases, using properly sharpened hand tools appropriate for the given job can provide a superior surface as compared to sanding, but subsequent finishing steps many or many not call out the benefit depending on choices that are made.
And since there is a learning curve to using hand tools (including the proper sharpening piece), unless one has the time to invest in that extra work, sanding may be the better choice at a given moment.
Relative to M&T, refining the fit with hand tools is a given...but while a snug fit is important, there's an advantage to an "imperfect surface" in the joint relative to glue-up. IMHO. Modern glues (PVA and it's variants) penetrate the wood for a strong joint once cured so a super slick surface might not be best for that initial penetration, especially on certain species of wood. What you actually want is "perfect shoulders" and what's inside is less critical if it fits properly.
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Machine cut joints....imporantance of cleaning up with hand tools??
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