You are right to be concerned. Studies have shown a strong link between teacher presence and student success.
On the other hand, I am a teacher and we do have a lot of professional development. The average new teacher works 80 hours per week. More experienced teaches often work 60 hours per week or more. When we have professional development, we still have to plan and prepare. This adds to our workload.
Personally, I am so busy during the school year that it is difficult for me to incorporate all of the great things that I an learning during professional development into my daily lessons.
Of course, we do get a lot of time off during the summer and during holidays. I did attend 17 days of professional development during the summer.
I too am for less time off during the summer. Students do forget so much. When I taught third grade, I noticed that the first 5 months were spent plaing catch-up, then students zoomed ahead. It was astonishing!
In France, students have Wednesdays off for sports, piano lessons, etc. if we were set up like that, we could have all of our meetings and professional development on that day. I would love to extend the school year and only work 45-50 hours per week. I think being fresher would make me better at my job. Some teachers take days off to combat exhaustion or to catch up on grading.
You are right to be concerning about not being contacted. I do not always contact parents when I should, but I have never not returned a call.