Consider the phase. If you are in liquid phase, will you actually see any appreciable influx velocity, I suspect not.
Also consider total perforation area. Does it exceed the minimum down hole ID. If it does, again little if any velocity due to DH choke (at potential max rate).
But overall, aside from a small cost, and a minor handling issue, and if there are any concerns, is there a significant downside to blast joints, I suggest not.
You mention cost - is 13Cr necessary? Big potential saving in the overall metallurgy selection for a 6yr well.
Just make sure you give yourself sufficient contingency options in case you need to set a BP in the area at a later date, and more so build in tubing options for a tubing cut later if needed, bearing in mind that if you do produce enough solids to have needed the blast joints, and if the lower packer is 'pull to release' you may loose the release/recovery option due to sand packing.
1. As a rule of thumb, under most conditions dry gas does not erode steels harder than N-80.
2. Tests conducted on surface lines showed that at an impingement angle of 10 degrees or less, the erosion wear for a hard, brittle material is essentially zero. The maximum wear rate occurred when the impingement angle was between 40 and 50 degrees. The wear rate increased when the solids in the slurry were harder than the tubular surface. Sand is slightly harder than steel. Barite is much less abrasive than hematite.
3. If the blast joint availability is an issue it might worth to consider installing of a polished nipple below the bottom of perf and a landing nipple above the top of perf. Regular tubing wall thickness logs shall be conducted after first year.
I hope this will help you.