Filter page in IM, allow indexing?

Question

Search Engine Optimization

Good afternoon, tell me, there is a IM with ~ 2000 positions and a flexible selection of goods by parameters, while the url is generated like /brand-color-material, etc. at the output we get thousands of pages where it can be located from several 1-2 to tens and hundreds of products, while the products are all naturally presented in catalogs.
The question is, does it make sense to leave them in the search, or is it better to disable indexing?
Hundreds and thousands of pages are constantly added and removed in Yandex.Webmaster, the reasons are different, sometimes the quality of the page is not enough (very few, units), mainly due to the nofollow tag (as you understand, filter pages are not indexed now in 99 cases out of 100 ) Is this normal behavior? Maybe instead of the nofollow tag, disable crawling in robots.txt ? or in this case the bot will still visit the pages?

Answer 1

Be sure to leave them out! Moreover, the optimization of such pages must be very painstakingly taken. This kind of filter brings in a huge amount of traffic when properly configured.