.htaccess wp-admin really needed ?

I have three different hosting packages, Hostgator, Inmotion and IONOS. I have had problems lately with updating plugins, and other admin functions. The hosting company said .htaccess in wp-admin is not neccessary plus some custom code that you recommend was breaking the administration functions, when I renamed the .htaccess for wp-admin things started working when I cleared custom code and regenerated wp-admin .htaccess things broke.

so I have deleted the .htaccess in wp-admin

Is it really necessary ? This all started happening after wordpress from wordpress 6.2 to 6.3 6.4 but even now with 6.2 installed sometimes I get timeout errors and other errors.