1) By having limitation on max burst boundary, allow efficient system design by enabling the arbitration logic in the interconnect to give all masters a fair chance at burst boundaries. Otherwise a master doing large bursts for a long time could potentially clog the system performance.
2) There is no meaning to have Strobe at read because read is always gives the data which is asked , Only writing has additional requirement if data should write fully or partially based on memory.
-Vinay Jain
