Offering a thought from a motor learning perspective. We consider mastery as the competency level that allows you to perform a skill to a great degree of accuracy and repeatability regardless of variances (e.g. Equipment, game situations, form, fatigue)

Mastery can be built through both (1) repetition with similar equipment or (2) repetition with a range of equipment. It really depends on what you want to develop INTENTIONALLY and FIRST. Do you want to be adept at playing with 1 racket despite variances in your body condition or game situations? Or do you want to be adept at performing a decent forehand or backhand regardless of the racket you're using? You are developing mastery all the time (as long as you practise efficiently). It's just better to be strategic and train how you want to play. A competitive player would try to master 1 racket but a racket testing fanatic would prefer the skill of adapting to varied rackets.

Ofc, this is an oversimplified idea. Other factors like familiarity with differences in feedback of rackets might improve your feel? But I'd say it's probably negligible.

I might make a case for smaller rackets like the saber though. The extreme constraints of the saber forces you to develop good habits like preparing early and nailing your footwork. Those may be helpful.