Sad as I am to see the discontinuity between my older MMPBs and newer TPBs, I admit it does look nice to have reprinted novels match up in size with their modern relatives, as can be seen here with Therin of Andor's Ex Machina.As to the number of releases, one way Star Wars has addressed that — and which Trek absolutely should replicate — is with its Essential Legends editions, which are slowly bringing all the old mass-market paperbacks back as the trade paperbacks that stores prefer to stock, while giving some of those releases audiobooks if they never had them before. A similar program for the Pocket Universe novels is devoutly to be desired, and would really bulk up the bookstore sections.
Christopher L Bennett's "Ex Machina" is now available as a reprint in Gallery's trade paperback format, making a great companion volume for the 2019 40th anniversary trade reprint of Gene Roddenberry's novelisation and Bennett's own March 2020 continuation, "The Higher Frontier" (which happens to be set on Andor).
TMP trilogy by Ian McLean, on Flickr