I think you have to look at the pros and cons of both. DD1 has been at SS since she was 4 and turns 11 on Saturday. She'll go on to SS secondary. She is very verbal, MLD, among the most able in her school by a long way.
Before she went to SS she had 1:1 in a preschool. I used to think that 30 hours 1:1 was my goal for her, with her SALT, OT, physio, etc. It's what she'd need in MS. But in SS it isn't like that. She gets SALT weaved throughout her curriculum, (she had specific programmes directly delivered by a SALT for problem areas such as articulation).
OT, again, is weaved into PE, etc. E.g. for DD1, her calf muscles are underdeveloped, so they made sure that PE included lots of specific types of jumping. Her fine motor skills are delayed, with weak fingers, so at choosing time there are lots of activities that promote those skills available to choose.
DD1 is taught in small groups as well as individually. Now, I wouldn't want her to have 1:1 support. She's so used to her independence in SS. Everything is set up to allow independence. But in MS she'd need it.
So, by all means, MS is your child's right except for certain limited circumstances, but do consider what you may be turning down.