Why MOST OF THE PROBLEMS WITHOUT "CONSTRAINTS"

Why most of the problems for practice available here are without constraints?
Constraints are most important part of a problem which decides the problems to be approached with exactly what approach. Does Leetcode always want users to try brute force and then see TLE/WA Then go for the original idea. If this is the case then please provide the constraints under the spoiler. It would facilitate users like me , who know that implementation of brute force is easier for them , they just want to calculate how to optimise their thoughts. My most of time is wasted in thinking that this problem lies to which category ,If constraints are not available.
Please do provide constraints to all 1500+ problems available here. It is a humble request to leetcode admin.
#constraintsmatter
@admin.

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